Number 1

Question 1

True or False?
All prime numbers bigger than 5
end in 1, 3, 7, or 9

Answer 1

True

Question 2

What is an integer?

Answer 2

A whole number
Can be positive, negative or zero

Question 3

When should you stop listing pairs of numbers when finding factors?

Answer 3

When a number is repeated

Question 4

True or False?
8.62 x 1000 = 862

Answer 4

False = 8620

Question 5

780 ÷ 12

Answer 5

65

Question 6

On a number line which way do you move to subtract?

Answer 6

Left

Question 7

What is
Prime Factorisation?

Answer 7

Writing a number as its prime factors multiplied together

Question 8

True or False?
The highest common factor of 30 and 45 is 15

Answer 8

True

Question 9

When you multiply a number by 10, how many places bigger do you move the decimal point?

Answer 9

One

Question 10

How do you find the lowest common multiple
using prime factors?

Answer 10

Put the prime factors in a Venn diagram,
then multiply all the numbers together in the Venn diagram

Question 11

If you multiply two negative numbers together,
will the answer be positive or negative?

Answer 11

Positive

Question 12

What should you circle in a factor tree?

Answer 12

Prime numbers

Question 13

When you divide a number by 100,
how many places smaller do you move the decimal point?

Answer 13

Two

Question 14

What is a square number?

Answer 14

A number that is made by multiplying a whole number by itself

Question 15

What does the completed top line of a short division calculation show?

Answer 15

The final answer

Question 16

How do you find the highest common factor using prime factors?

Answer 16

Put the prime numbers in a Venn Diagram.
Multiply the prime numbers together that are in the overlapping section

Question 17

What do the letters BIDMAS stand for?

Answer 17

Brackets, Indices,
Division, Multiplication,
Addition, Subtraction

Question 18

What is a prime number?

Answer 18

A number with exactly two factors.
One and itself

Question 19

Is 30 a multiple of 12 ?

Answer 19

No
30 isn’t in the 12 times table

Question 20

How would you use
38 x 24 = 912
to work out
3.8 x 2.4 ?

Answer 20

Because you divided the 38 by 10 and divided the 24 by 10 on the left hand side,

You need to divide the 912 by 100 on the right hand side

4.3.8 x 2.4 = 9.12

Question 21

What is a factor of a number?

Answer 21

A number that divides into it

Question 22

If you work out 1530 ÷ 10 = 153.0
what is the last step do you need to do?

Answer 22

Remove the decimal point and the zero after it

Question 23

Is the answer to
5 - - 8
positive or negative?

Answer 23

Positive
5 - - 8 = 13

Question 24

In the calculation
4 x 3 + 2
What should be carried out first?

Answer 24

The multiplication
4 x 3

Question 25

Calculate 32 x 17 without a calculator

Answer 25

544

Question 26

The prime factors that appear in both of two numbers are 2, 3, 3 and 5 What is the highest common factor of the two numbers?

Answer 26

90

Question 27

What are the first four square numbers?

Answer 27

1, 4, 9, 16

Question 28

How would you use 65 x 3 = 195 to work out 65 x 300

Answer 28

Because you multiplied the 3 by 100 on the left hand side, You need to multiply the 195 by 100 on the right hand side 65 x 300 = 19,500

Question 29

What would be the first step in working out 36 ÷ 0.15 ?

Answer 29

Write the division as a fraction

Question 30

What is lowest common multiple?

Answer 30

The **smallest** number that is **in all** of the **lists of multiples**, produced from the numbers in question

Question 31

What is a cube number?

Answer 31

A number made by multiplying a whole number by itself twice. e.g. 5³ = 5 x 5 x 5 = 125

Question 32

What is a highest common factor?

Answer 32

The biggest number that is in all the lists of factors, that have been produced from the numbers in question

Question 33

What is the first thing you should do to work out 23 x 2000 ?

Answer 33

Multiply 23 by 2 23 x 2000 = 46000

Question 34

What is the lowest common multiple of 4 and 5 ?

Answer 34

20

Question 35

What are the first four prime numbers?

Answer 35

2, 3, 5, 7

Question 36

Is the answer to -6 ÷ 3 positive or negative?

Answer 36

Negative -6 ÷ 3 = -2

Question 37

In the calculation 7 - 12 + 8 What should be carried out first?

Answer 37

The subtraction 7 - 12

Question 38

When calculating 852 ÷ 3 using short division, how would you record the result of dividing 8 by 3 in your working?

Answer 38

Write 2 above the line and carry the remainder 2 to the next digit

Question 39

What is a multiple of a number?

Answer 39

A value in a number's times table

Question 40

What is the product of prime factors for 140 ?

Answer 40

2 x 2 x 5 x 7 OR 2² x 5 x 7