maths smart grade 4 © 2012 alston publishing house pte ltd 8-point compass

Maths Sm

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2012 Alston Publishing House Pte Ltd

8-pointcompass

8-point compassM

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Maths Sm

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2012 Alston Publishing House Pte LtdAcute angle

Acute angleM

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Angles smaller than 90 are called acute angles.

Example:

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Approximately equal to ()

The sign means ‘approximately equal to’.

Example:

3468 3470 (when rounded to the nearest ten)

Approximately equal to ()M

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Maths Sm

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2012 Alston Publishing House Pte LtdCentre mark

Centre markM

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Maths Sm

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2012 Alston Publishing House Pte LtdCommon factors

Common factorsM

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Example:

1 and 2 are common factors of 6 and 10.

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Common multiples

Common multiplesM

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Example:

6, 12 and 18 are some common multiples of 2 and 3.

Maths Sm

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2012 Alston Publishing House Pte LtdCoordinates

CoordinatesM

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Example:

The strawberry is located at the point (2, 4).The point (2, 4) is a pair of coordinates.

Maths Sm

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2012 Alston Publishing House Pte LtdCoordinate grid

Coordinate gridM

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Example:

This is a coordinate grid.

Maths Sm

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2012 Alston Publishing House Pte LtdDegree ()

We measure the size of an angle in degrees. We can also write for degree(s).

Degree ()M

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Maths Sm

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2012 Alston Publishing House Pte LtdEast

EastM

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Maths Sm

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2012 Alston Publishing House Pte LtdFactors

FactorsM

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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.

Maths Sm

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2012 Alston Publishing House Pte LtdHeptagon

HeptagonM

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A heptagon has 7 straight sides and 7 vertices.

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdHundreds

HundredsM

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Example:

2 hundreds = 200We can say that the value of 2 hundreds is the same as 200.

Maths Sm

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2012 Alston Publishing House Pte LtdInner scale

Inner scaleM

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Maths Sm

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Irregular polygon

Irregular polygonM

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

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdMultiples

MultiplesM

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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.

Maths Sm

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2012 Alston Publishing House Pte LtdNet

NetM

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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.

Maths Sm

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2012 Alston Publishing House Pte LtdNorth

NorthM

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Maths Sm

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2012 Alston Publishing House Pte LtdNorth-east

North-eastM

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Maths Sm

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2012 Alston Publishing House Pte LtdNorth-west

North-westM

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Maths Sm

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2012 Alston Publishing House Pte LtdObtuse angle

Obtuse angleM

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Angles greater than 90 but smaller than 180 are called obtuse angles.

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdOctagon

OctagonM

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An octagon has 8 straight sides and 8 vertices.

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdOrigin

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

OriginM

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Maths Sm

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2012 Alston Publishing House Pte LtdOuter scale

Outer scaleM

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Maths Sm

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2012 Alston Publishing House Pte LtdPolygon

PolygonM

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

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdPrime numbers

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

Prime numbersM

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Maths Sm

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2012 Alston Publishing House Pte LtdProduct

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

ProductM

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Maths Sm

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2012 Alston Publishing House Pte LtdProtractor

ProtractorM

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

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdQuadrilateral

QuadrilateralM

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A quadrilateral has 4 straight sides and 4 vertices.

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdQuotient

QuotientM

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

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdRegroup

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

RegroupM

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Maths Sm

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2012 Alston Publishing House Pte LtdRegular polygon

Regular polygonM

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A regular polygon has all equal sides and all equal angles.

Example:

Maths Sm

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2012 Alston Publishing House Pte LtdRemainder

RemainderM

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

Example:

Right angleM

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A right angle is 90.

Example:

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 hundredM

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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 thousandM

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SouthM

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South-eastM

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South-westM

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ThousandsM

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Example:

5 thousands = 5000We can say that the value of 5 thousands is the same as 5000.

UnitM

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Each in a bar model stands for 1 unit.

Example:

1 unit 295 units 29 × 5 = 145

WestM

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X-axisM

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X-coordinateM

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Y-axisM

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Y-coordinateM

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Zero lineM

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maths smart grade 4 © 2012 alston publishing house pte ltd 8-point compass

Documents

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