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8-point
compass
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8-point compass
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Acute angle
Angles smaller than 90 are called acute angles.
Example:
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Acute angle
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Approximately
equal to ()
The sign  means ‘approximately equal to’.
Example:
3468  3470 (when rounded to the nearest ten)
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Approximately equal to ()
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Centre mark
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Centre mark
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Common factors
Example:
1 and 2 are common factors of 6 and 10.
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Common factors
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Common
multiples
Example:
6, 12 and 18 are some common multiples of 2
and 3.
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Common multiples
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Coordinates
Example:
The strawberry is located at the point (2, 4).
The point (2, 4) is a pair of coordinates.
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Coordinates
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Coordinate grid
Example:
This is a coordinate grid.
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Coordinate grid
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Degree ()
We measure the size of an angle in degrees.
We can also write  for degree(s).
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Degree ()
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East
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East
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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.
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Factors
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Heptagon
A heptagon has 7 straight sides and 7 vertices.
Example:
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Heptagon
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Hundreds
Example:
2 hundreds = 200
We can say that the value of 2 hundreds is
the same as 200.
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Hundreds
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Inner scale
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Inner scale
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Irregular
polygon
An irregular polygon has sides and angles that are
not all equal.
Example:
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Irregular polygon
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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.
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Multiples
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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.
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Net
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North
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North
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North-east
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North-east
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North-west
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North-west
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Obtuse angle
Angles greater than 90 but smaller than 180 are
called obtuse angles.
Example:
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Obtuse angle
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Octagon
An octagon has 8 straight sides and 8 vertices.
Example:
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Octagon
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Origin
The pair of coordinates (0, 0) is called the origin.
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Origin
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Outer scale
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Outer scale
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Polygon
A polygon is a closed figure. Its sides are formed by
straight lines that do not cross one another.
Example:
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Polygon
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Prime numbers
A prime number has only two factors, 1 and the
number itself.
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Prime numbers
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Product
When we multiply numbers, the answer is called
the product.
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Product
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Protractor
We can find the size of an angle by measuring it
with a protractor.
Example:
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Protractor
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Quadrilateral
A quadrilateral has 4 straight sides and 4 vertices.
Example:
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Quadrilateral
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Quotient
When we divide a number by another, the answer
we get is called the quotient.
Example:
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Quotient
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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
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Regroup
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Regular polygon
A regular polygon has all equal sides and all equal
angles.
Example:
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Regular polygon
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Remainder
Remainder is the amount that is left over when a
number is divided by another number.
Example:
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Remainder
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Right angle
A right angle is 90.
Example:
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Right angle
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Round to the
nearest hundred
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.
Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd
Round to the nearest hundred
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.
(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.
Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd
Round to the nearest thousand
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South
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South
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South-east
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South-east
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South-west
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South-west
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Thousands
Example:
5 thousands = 5000
We can say that the value of 5 thousands is
the same as 5000.
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Thousands
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Unit
Each
in a bar model stands for 1 unit.
Example:
1 unit  29
5 units  29 × 5 = 145
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Unit
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West
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West
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X-axis
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X-axis
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X-coordinate
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X-coordinate
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Y-axis
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Y-axis
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Y-coordinate
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Y-coordinate
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Zero line
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Zero line