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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

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Acute angle

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

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

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

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Centre mark

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Common factors

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

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East

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Factors

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

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Irregular polygon

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd 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 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 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

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North-east

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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North-west

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Obtuse angle

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

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Outer scale

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Polygon

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd 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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A prime number has only two factors, 1 and the number itself. Prime numbers Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Product

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

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Protractor

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

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Regular polygon

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

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

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

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Round to the nearest thousand

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

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South

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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South-east

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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South-west

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Thousands

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

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X-axis

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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X-coordinate

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Y-axis

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Y-coordinate

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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Zero line

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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

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