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

## Presentation on theme: "Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd"— Presentation transcript:

8-point compass

8-point compass

Acute angle

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:

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

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)

Centre mark

Centre mark

Common factors

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.

Common multiples

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.

Coordinates

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.

Coordinate grid

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.

Degree ()

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).

East

East

Factors

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.

Heptagon

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:

Hundreds

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.

Inner scale

Inner scale

Irregular polygon

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

Multiples

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.

Net

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.

North

North

North-east

North-east

North-west

North-west

Obtuse angle

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

Octagon

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:

Origin

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.

Outer scale

Outer scale

Polygon

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

Prime numbers

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

Product

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.

Protractor

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

Quotient

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

Regroup

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

Regular polygon

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

Remainder

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

Right angle

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:

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

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.

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

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.

South

South

South-east

South-east

South-west

South-west

Thousands

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.

Unit

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

West

West

X-axis

X-axis

X-coordinate

X-coordinate

Y-axis

Y-axis

Y-coordinate

Y-coordinate