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Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Anti-clockwise
An anti-clockwise direction is the direction that is
opposite of the way the hands of a clock turn, i.e.,
towards the left.
Example:
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Anti-clockwise
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Backward
To move in a reverse direction.
Example:
Ari moves 4 steps backward to get to the tree.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Backward
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Bar model
A bar model can be used to represent a word
problem.
Example:
There are 15 orange ribbons and 8 blue ribbons.
How many ribbons are there altogether?
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Bar model
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Between
Example:
17 is between 16 and 18.
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Between
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Clockwise
The hands of a clock turn in a clockwise direction,
i.e., towards the right.
Example:
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Clockwise
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Comparison
model
A comparison model is a type of bar model. It helps
us compare two sets of objects.
Example:
Set B has 15 more than Set A.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Comparison model
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Curved
Not straight or flat.
Example:
Cones, cylinders and spheres have curved faces.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Curved
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Edge
In a solid, an edge is formed when two faces meet.
It can be curved or straight.
Example:
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Edge
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Estimate
A reasonable guess of the actual number.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Estimate
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Even number
An even number has 0, 2, 4, 6 or 8 in the ones
place.
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Even number
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Face
One part of a solid; it can be flat or curved.
Example:
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Face
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Fraction
A part of a whole that has been cut into equal
parts.
Example:
1
1
The shaded part is of the circle. is a fraction.
2
2
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Fraction
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Forward
To move ahead, towards the front.
Example:
Rita walks 2 steps forward to get to the tree.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Forward
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Half turn
Example:
If Smarty makes a half turn either clockwise or
anti-clockwise, he will face the television.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Half turn
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Hexagon
A hexagon has 6 straight sides and 6 vertices.
Example:
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Hexagon
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Line of
symmetry
A line of symmetry cuts a shape into two halves
that fit onto each other exactly when the shape is
folded along the line.
Example:
line of symmetry
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Line of symmetry
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Number line
A line marked with numbers in increasing order from
left to right. The markings on a number line are equally
spaced. Each marking represents one number.
Example:
This is a number line that shows numbers from 0 to 10.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Number line
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Odd number
An odd number has 1, 3, 5, 7 or 9 in the ones place.
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Odd number
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One eighth
When a whole has been divided into 8 equal parts,
we say that each part is one eighth ( 1 ) of the
8
whole.
Example:
1
8
whole
of the whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One eighth
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One fifth
When a whole has been divided into 5 equal parts,
we say that each part is one fifth ( 1 ) of the whole.
5
Example:
whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One fifth
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One half
When a whole has been divided into 2 equal parts,
we say that each part is one half ( 1 ) of the whole.
2
Example:
1
2
whole
of the whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One half
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One quarter
When a whole has been divided into 4 equal parts,
we say that each part is one quarter ( 1 ) of the
4
whole.
Example:
1
4
whole
of the whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One quarter
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One tenth
When a whole has been divided into 10 equal
parts, we say that each part is one tenth ( 1 ) of the
10
whole.
Example:
1
10
whole
of the whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One tenth
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One third
When a whole has been divided into 3 equal parts,
we say that each part is one third ( 1 ) of the whole.
3
Example:
1
3
whole
of the whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
One third
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Ones
Example:
23 ones = 23
We can say that the value of 23 ones is the same
as 23.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Ones
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Part-whole
model
A part-whole model is a type of bar model.
Example:
part + part = whole
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Part-whole model
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Pentagon
A pentagon has 5 straight sides and 5 vertices.
Example:
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Pentagon
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Quarter turn
Example:
If Smarty makes a quarter turn clockwise, he will face
the lamp.
If he makes a quarter turn anti-clockwise, he will face
the bookshelf.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Quarter turn
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Rectangular
pyramid
A rectangular pyramid has 5 flat faces (1 rectangular
and 4 triangular). It also has 8 edges and 5 vertices.
Example:
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Rectangular pyramid
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Regroup
When we add the ones and get more than 9 ones,
we need to regroup the ones into tens and ones.
Example:
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Regroup
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Round (to the
nearest ten)
Example:
46 is closer to 50 than to 40. So, when we round 46
to the nearest ten, we get 50.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Round (to the nearest ten)
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Semicircle
A semicircle is half a circle. It has 1 curved side,
1 straight side and 2 vertices.
Example:
straight side
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Semicircle
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Straight
Not curved.
Example:
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Straight
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Symmetrical
A figure is symmetrical if one half of the figure is
a mirror image of the other. One side should fit
exactly onto the other when folded in half.
Example:
This heart-shaped figure is a symmetrical figure.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Symmetrical
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Tens
Example:
4 tens = 40
We can say that the value of 4 tens is the same
as 40.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Tens
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Tetrahedron
A tetrahedron has 4 triangular faces, 6 edges and
4 vertices.
Example:
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Tetrahedron
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Unit fraction
Unit fractions have the number 1 on the top.
Example:
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Unit fraction
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Value
Example:
In the number 63, the digit 6 stands for 6 tens and
it has a value of 60.
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Value
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Vertex (Vertices)
A vertex is formed when 2 sides meet at a point.
More than one vertex can be referred to as vertices.
Example:
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Vertex (Vertices)
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Whole
Examples:
(a) 2 halves make 1 whole.
(b) 4 quarters make 1 whole.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Whole
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Whole turn
Example:
If Smarty makes a whole turn clockwise, he will still
face the sofa.
Maths SMART Grade 2 © 2012 Alston Publishing House Pte Ltd
Whole turn