maths smart grade 5 © 2012 alston publishing house pte ltd 12-hour clock notation

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte Ltd

12-hour clock notation

12-hour clock notationM

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Example:

9.00 a.m. and 5.00 p.m. are examples of times written using 12-hour clock notation.

Maths SM

ART Grade 5 ©


24-hour clock notation

24-hour clock notationM

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When we write time using 24-hour clock notation, the time is written using four digits. The first two digits represent the hours and the last two digits represent the minutes.

Example:

9.00 a.m. is written as 09 00 and 5.00 p.m. is written as 17 00 when using 24-hour clock notation.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdAcute angle

Acute angleM

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Angles smaller than 90 are called acute angles.

Example:

Maths SM

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2012 Alston Publishing House Pte LtdAdjacent

AdjacentM

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Two angles next to each other are called adjacent angles.

Example:

Maths SM

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2012 Alston Publishing House Pte LtdAngles at a point

Angles at a pointM

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The sum of angles at a point is 360.

Example:

Maths SM

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Angles in a triangle

Angles in a triangleM

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The sum of angles in a triangle is 180.

Example:

Maths SM

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Angles on a straight line

Angles on a straight lineM

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The sum of angles on a straight line is 180.

Example:

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdArea

AreaM

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Area is the amount of space inside a flat shape or figure. We find the area of a square or rectangle by using:

Area = Length × Breadth

Example:

Find the area of the rectangle shown.

Area of rectangle = 8 cm × 2 cm = 16 cm2

The area of the rectangle is 16 cm2.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdBreadth

BreadthM

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The shorter side of a rectangle is called its breadth.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdCentre mark

Centre markM

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Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdCertain

CertainM

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An event is certain if it will always happen.

Maths SM

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2012 Alston Publishing House Pte LtdChance

ChanceM

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The probability of an event is the chance or likelihood of it happening.

Maths SM

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2012 Alston Publishing House Pte LtdConvert

ConvertM

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We can convert from one unit of measurement to another.

Example:

Convert 0.4 km into metres.

0.4 km = 0. 4 × 1000 m= 400 m

We get 400 m when we convert 0.4 km into metres.

Maths SM

ART Grade 5 ©

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 LtdDuration

DurationM

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Example:

A ballet performance lasted for 1 h 45 min. We can also say that the duration of the ballet performance was 1 h 45 min.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdEqually likely

Equally likelyM

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An event is equally likely if it has an even chance of happening.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdEven chance

Even chanceM

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An event is equally likely if it has an even chance of happening.

Maths SM

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2012 Alston Publishing House Pte LtdEvent

EventM

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An event is something that happens.

Maths SM

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2012 Alston Publishing House Pte LtdGood chance

Good chanceM

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An event is likely if it has a good chance of happening.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdImage

ImageM

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The figure formed after a transformation is known as an image.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdImpossible

ImpossibleM

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An event is impossible if it will never happen, or has no chance of happening.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdInner scale

Inner scaleM

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Maths SM

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2012 Alston Publishing House Pte LtdLength

LengthM

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The longer side of a rectangle is called its length.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdLikelihood

LikelihoodM

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Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdLikely

LikelyM

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An event is likely if it has a good chance of happening.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdLine graph

Line graphM

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A line graph is used to represent data which changes over time.

Example:

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdMirror image

Mirror imageM

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Example:

The reflected Triangle R’S’T’ is a mirror image of Triangle RST. It has the same size and shape as the original triangle.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdMirror line

Mirror lineM

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Example:

In a reflection, the mirror line acts as the line of symmetry.

mirror line

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdNo chance

No chanceM

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An event is impossible if it will never happen, or has no chance of happening.

Maths SM

ART Grade 5 ©

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

ART Grade 5 ©

2012 Alston Publishing House Pte LtdOutcome

OutcomeM

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An outcome is a result.

Example:

When we throw a die, the possible outcomes are the numbers 1 to 6.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdOuter scale

Outer scaleM

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Maths SM

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2012 Alston Publishing House Pte LtdPercent (%)

Percent (%)M

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Percent (%) means out of 100.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdPerimeter

PerimeterM

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The perimeter of a figure is the total distance around all the sides of the figure. We find the perimeter of a figure by adding up the lengths of all its sides.

Example:

Find the perimeter of the rectangle shown.

Perimeter of rectangle = 5 m + 3 m + 5 m + 3 m = 16 m

The perimeter of the rectangle is 16 m.

Maths SM

ART Grade 5 ©

2012 Alston Publishing House Pte LtdPoor chance

Poor chanceM

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An event is unlikely if it has a poor chance of happening.

Maths SM

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2012 Alston Publishing House Pte LtdProbability

ProbabilityM

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Maths SM

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2012 Alston Publishing House Pte LtdProbability line

Probability lineM

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A probability line can be used to show the chance or likelihood of an event happening.

Example:

This is a probability line.

ProtractorM

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

Example:

QuadrantM

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The x-axis and the y-axis divide the coordinate grid into four sections. Each section is called a quadrant.

Example:

ReflectionM

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When a polygon is reflected, each vertex of the polygon is at an equal and perpendicular distance from the mirror line as its image. The size and shape of the image after reflection is the same as the original polygon.

Example:

ScaleM

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Markings at regular intervals on a graph.

Example:

Second (s)M

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A unit of measurement for time.

Example:

1 minute = 60 seconds

Second handM

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A clock has an hour hand, a minute hand and a second hand. The second hand shows us the number of seconds that has passed in one minute.

second hand

StopwatchM

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A stopwatch measures duration in minutes and seconds.

Time lineM

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A time line can be used to calculate duration.

Example:

This time line shows the duration from 20 15 to 22 20.

TranslationM

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When a polygon is translated, each vertex of the polygon moves the same distance in the same direction. The size and shape of the image after translation is the same as the original polygon.

Example:

TransformationM

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A transformation is the change in the position, shape or size of an object.

Example:

UnlikelyM

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An event is unlikely if it has a poor chance of happening.

Vertically opposite anglesM

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Vertically opposite angles are formed when two straight lines cross each other at a point. Vertically opposite angles are equal.

Example:

X-axisM

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X-coordinateM

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Y-axisM

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Y-coordinateM

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maths smart grade 5 © 2012 alston publishing house pte ltd 12-hour clock notation

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maths smart grade

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area slide

convert slide

breadth slide

chance slide

certain slide

adjacent slide