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 does BIDMAS mean and what does it stand for?

Answer 5

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

Brackets

Indices

Division

Multiplication

Addition

Subtraction

Question 6

What is an angle bisector?

Answer 6

A line that cuts an angle in half.

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

Question 7

What does consecutive mean?

Answer 7

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 8

What does congruent mean?

Answer 8

Exactly the same size and shape.

Question 9

What does correlation mean?

Answer 9

The degree of relationship between two sets of data.

Question 10

What is a cube number?

Answer 10

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 11

What is a cube root?

Answer 11

The number that, when cubed, equals the number given

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

Question 12

What is a denominator?

Answer 12

The denominator is the bottom number of a fraction.

Question 13

What is an edge of a 3D shape?

Answer 13

An edge is a line where two faces meet.

Question 14

What does equidistant mean?

Answer 14

The same distance away from two points.

e.g. A is equidistant from B and C

Question 15

What is an exterior angle?

Answer 15

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

Question 16

What is a face of a 3D shape?

Answer 16

A face is a flat surface on the solid.

Question 17

What is a factor?

Answer 17

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 18

What does expanding an expression mean?

Answer 18

Multiplying out the brackets

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

Question 19

What does factorising an expression mean?

Answer 19

Putting it into brackets.

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

Question 20

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

Answer 20

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 21

What is an improper fraction?

Answer 21

An improper fraction has a larger numerator than denominator.

Question 22

What is an integer?

Answer 22

A positive or negative whole number.

Question 23

What is an interior angle?

Answer 23

The angle formed between two adjacent sides of a polygon.

Question 24

What does the intersection of two graphs mean?

Answer 24

The point where they cross.

Question 25

What is a line of best fit?

Answer 25

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

Question 26

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

Answer 26

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 27

What is a multiple?

Answer 27

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 28

What is a numerator?

Answer 28

The number on the top of a fraction.

Question 29

What is the origin on a graph?

Answer 29

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

Question 30

What does parallel mean?

Answer 30

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

Question 31

What does perpendicular mean?

Answer 31

Perpendicular lines cross at a right angle.

Question 32

What is a polygon?

Answer 32

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

Question 33

What is a prime number?

Answer 33

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 34

What is a reciprocal?

Answer 34

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 35

What is a regular polygon?

Answer 35

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

Question 36

What does similar mean?

Answer 36

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

Question 37

What is a square number?

Answer 37

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 38

What is a square root?

Answer 38

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 39

What is a triangle number?

Answer 39

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 40

What is a vertex?

Answer 40

A vertex is a corner of a 3D shape.

Question 41

What is a mixed number?

Answer 41

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

Question 42

What is a hypotenuse?

Answer 42

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

Question 43

What is cumulative frequency?

Answer 43

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