Maths Vocabulary

Question 1

What is an acute angle?

Answer 1

An angle less than 90 degrees.

Question 2

What is a right angle?

Answer 2

An angle of 90 degrees.

Question 3

What is an obtuse angle?

Answer 3

An angle greater than 90 degrees and less than 180 degrees.

Question 4

What is a reflex angle?

Answer 4

An angle greater than 180 degrees.

Question 5

What is a bearing?

Answer 5

The angle of a line measured clockwise from north

Question 6

What does BIDMAS mean and what does it stand for?

Answer 6

BIDMAS is the order of operations you do a calculation in. It stands for

Brackets

Indices

Division

Multiplication

Addition

Subtraction

Question 7

What is an angle bisector?

Answer 7

A line that cuts an angle in half.

You should know how to construct one using a pair of compasses and a ruler.

Question 8

What does consecutive mean?

Answer 8

Following on immediately from the term before

e.g. 3,4,5,6 are consecutive numbers

3,6,9,12 are consecutive multiples of 3.

Question 9

What does congruent mean?

Answer 9

Exactly the same size and shape.

Question 10

What does correlation mean?

Answer 10

The degree of relationship between two sets of data.

Question 11

What is a cube number?

Answer 11

A number that is another whole number cubed e.g.

1³ = 1 x 1 x 1 = 1

2³ = 2 x 2 x 2 = 8

3³ = 3 x 3 x 3 = 27

so 1, 8 and 27 are the first three cube numbers.

Question 12

What is a cube root?

Answer 12

The number that, when cubed, equals the number given

e.g. the cube root of 8 is 2 since 2³=8.

Question 13

What is a denominator?

Answer 13

The denominator is the bottom number of a fraction.

Question 14

What is an edge of a 3D shape?

Answer 14

An edge is a line where two faces meet.

Question 15

What does equidistant mean?

Answer 15

The same distance away from two points.

e.g. A is equidistant from B and C

Question 16

What is an exterior angle?

Answer 16

The angle formed between a polygon and a line extended fron one of its sides.

Question 17

What is a face of a 3D shape?

Answer 17

A face is a flat surface on the solid.

Question 18

What is a factor?

Answer 18

A factor is a number that divides into another number exactly.

e.g. 6 is a factor of 18

2 is a factor of 40

Question 19

What does expanding an expression mean?

Answer 19

Multiplying out the brackets

e.g. 3(y + 1) = 3y + 3

Question 20

What does factorising an expression mean?

Answer 20

Putting it into brackets.

e.g. 6z - 3 = 3(2z - 1)

Question 21

What is the highest common factor (HCF) of two numbers?

Answer 21

The highest common factor is the biggest number that divides into both.

e.g. the HCF of 30 and 12 is 6

If you list the factors of 30 and 12, 6 is the largest number in both lists.

Question 22

What is an improper fraction?

Answer 22

An improper fraction has a larger numerator than denominator.

Question 23

What is an integer?

Answer 23

A positive or negative whole number.

Question 24

What is an interior angle?

Answer 24

The angle formed between two adjacent sides of a polygon.

Question 25

What does the intersection of two graphs mean?

Answer 25

The point where they cross.

Question 26

What is a line of best fit?

Answer 26

A straight line drawn on a scatter graph that fits the data as closely as possible.

Question 27

What is the lowest common multiple (LCM) of two numbers?

Answer 27

The smallest number that they both go into

e.g. the LCM of 6 and 8 is 24

If you write out the times tables of 6 and 8, 24 is the smallest number in both lists.

Question 28

What is a multiple?

Answer 28

The multiples of a number are those numbers that can be divided by it; the numbers in its times table.

e.g. the multiples of 7 are

7, 14, 21, 28, 35,…

Question 29

What is a numerator?

Answer 29

The number on the top of a fraction.

Question 30

What is the origin on a graph?

Answer 30

The place where the axes cross. The point (0,0).

Question 31

What does parallel mean?

Answer 31

Parallel lines have a constant distance between them and will never cross. They have the same gradient.

Question 32

What does perpendicular mean?

Answer 32

Perpendicular lines cross at a right angle.

Question 33

What is a polygon?

Answer 33

A polygon is a 2D shape with 3 or more straight sides.

Question 34

What is a prime number?

Answer 34

A prime number has exactly two factors, itself and 1. The first five prime numbers are

2,3,5,7,11

1 is not a prime number.

Question 35

What is a reciprocal?

Answer 35

The reciprocal of a number is 1 divided by the number.

To find the reciprocal of a fraction, flip it upside down.

e.g. the reciprocal of 2 is 1/2

the reciprocal of 4/7 is 7/4

Question 36

What is a regular polygon?

Answer 36

A regular polygon has all side lengths and angles the same.

Question 37

What does similar mean?

Answer 37

Similar shapes are exactly the same shape but can be different sizes.

Question 38

What is a square number?

Answer 38

A number that is another whole number squared e.g.

1² = 1 x 1 = 1

2² = 2 x 2 = 4

3² = 3 x 3 = 9

so 1, 4 and 9 are the first three square numbers.

Question 39

What is a square root?

Answer 39

A square root is the number that, when squared, equals the number given.

e.g. The square root of 4 is 2 since 2² = 4

Question 40

What is a triangle number?

Answer 40

A number that can be represented by a traingular arrangement of dots. A number in the sequence

1, 1+2, 1+2+3, 1+2+3+4 etc.

Question 41

What is a vertex?

Answer 41

A vertex is a corner of a 3D shape.

Question 42

What is a mixed number?

Answer 42

A mixed number has a whole number part and a fractional part.

Question 43

What is a hypotenuse?

Answer 43

The hypotenuse is the longest side of a right angled triangle; the side opposite the right angle.

Question 44

What is cumulative frequency?

Answer 44

The cumulative frequency is the sum of all the frequencies so far in a distribution. It is a ‘running total’.