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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

8-point compass

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

8-point compass

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Acute angle

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**Acute angle Angles smaller than 90 are called acute angles. Example:**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Acute angle Angles smaller than 90 are called acute angles. Example:

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**Approximately equal to ()**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Approximately equal to ()

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**Approximately equal to ()**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Approximately equal to () The sign means ‘approximately equal to’. Example: 3468 3470 (when rounded to the nearest ten)

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Centre mark

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Centre mark

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Common factors

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**Common factors Example: 1 and 2 are common factors of 6 and 10.**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Common factors Example: 1 and 2 are common factors of 6 and 10.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Common multiples

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**Common multiples Example:**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Common multiples Example: 6, 12 and 18 are some common multiples of 2 and 3.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Coordinates

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**Coordinates Example: The strawberry is located at the point (2, 4).**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Coordinates Example: The strawberry is located at the point (2, 4). The point (2, 4) is a pair of coordinates.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Coordinate grid

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**Coordinate grid Example: This is a coordinate grid.**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Coordinate grid Example: This is a coordinate grid.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Degree ()

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**Degree () We measure the size of an angle in degrees.**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Degree () We measure the size of an angle in degrees. We can also write for degree(s).

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

East

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

East

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Factors

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Factors The factors of a number are the numbers that it can be divided exactly by. Example: The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Heptagon

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**Heptagon A heptagon has 7 straight sides and 7 vertices. Example:**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Heptagon A heptagon has 7 straight sides and 7 vertices. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Hundreds

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**Hundreds Example: 2 hundreds = 200**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Hundreds Example: 2 hundreds = 200 We can say that the value of 2 hundreds is the same as 200.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Inner scale

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Inner scale

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Irregular polygon

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Irregular polygon An irregular polygon has sides and angles that are not all equal. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Multiples

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Multiples A multiple of a number is the product of that number and any number. A number is a factor of all its multiples. Example: 3, 6, 9 and 12 are the first four multiples of 3.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Net

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Net A figure which can be folded to form a solid is called the net of the solid. Example: This is a net of a cuboid.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

North

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

North

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

North-east

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

North-east

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

North-west

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

North-west

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Obtuse angle

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Obtuse angle Angles greater than 90 but smaller than 180 are called obtuse angles. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Octagon

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**Octagon An octagon has 8 straight sides and 8 vertices. Example:**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Octagon An octagon has 8 straight sides and 8 vertices. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Origin

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**Origin The pair of coordinates (0, 0) is called the origin.**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Origin The pair of coordinates (0, 0) is called the origin.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Outer scale

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Outer scale

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Polygon

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Polygon A polygon is a closed figure. Its sides are formed by straight lines that do not cross one another. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Prime numbers

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Prime numbers A prime number has only two factors, 1 and the number itself.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Product

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**Product When we multiply numbers, the answer is called the product.**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Product When we multiply numbers, the answer is called the product.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Protractor

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Protractor We can find the size of an angle by measuring it with a protractor. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Quadrilateral

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**Quadrilateral A quadrilateral has 4 straight sides and 4 vertices.**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Quadrilateral A quadrilateral has 4 straight sides and 4 vertices. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Quotient

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Quotient When we divide a number by another, the answer we get is called the quotient. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Regroup

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**Regroup We need to regroup in a place value when**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Regroup We need to regroup in a place value when we get more than 9 after adding or multiplying; or we subtract a greater number from a smaller number; or we get a remainder in place values other than the ones place when dividing

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Regular polygon

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Regular polygon A regular polygon has all equal sides and all equal angles. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Remainder

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Remainder Remainder is the amount that is left over when a number is divided by another number. Example:

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Right angle

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**Right angle A right angle is 90. Example:**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Right angle A right angle is 90. Example:

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**Round to the nearest hundred**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Round to the nearest hundred

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**Round to the nearest hundred**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Round to the nearest hundred When we round a number to the nearest hundred, we look at the digit in the tens place. If the digit < 5, we round it to the smaller hundred. If the digit > 5, we round it to the bigger hundred. If the digit = 5, we round it to the bigger hundred.

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**Round to the nearest thousand**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Round to the nearest thousand

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**Round to the nearest thousand**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Round to the nearest thousand When we round a number to the nearest thousand, we look at the digit in the hundreds place. If the digit < 5, we round it to the smaller thousand. If the digit > 5, we round it to the bigger thousand. If the digit = 5, we round it to the bigger thousand.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

South

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

South

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

South-east

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

South-east

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

South-west

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

South-west

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Thousands

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**Thousands Example: 5 thousands = 5000**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Thousands Example: 5 thousands = 5000 We can say that the value of 5 thousands is the same as 5000.

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Unit

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**Unit Each in a bar model stands for 1 unit. Example: 1 unit 29**

Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Unit Each in a bar model stands for 1 unit. Example: 1 unit 29 5 units 29 × 5 = 145

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

West

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

West

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

X-axis

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

X-axis

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

X-coordinate

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

X-coordinate

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Y-axis

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Y-axis

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Y-coordinate

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Y-coordinate

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Zero line

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**Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd**

Zero line

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