Number

Question 1

5-7

Answer 1

-2

Question 2

-5-7

Answer 2

-12

Question 3

-5 - -7

Answer 3

2

Question 4

8 x -2

Answer 4

-16

Question 5

-3 x 6

Answer 5

-18

Question 6

-7 x -4

Answer 6

28

Question 7

21 ÷ -3

Answer 7

-7

Question 8

-20 ÷ -4

Answer 8

5

Question 9

-35 ÷ 5

Answer 9

-7

Question 10

negative x negative

Answer 10

Positive answer

Question 11

negative x positive

Answer 11

Negative answer

Question 12

Is this number divisible by 3?

3621

How do you know?

Answer 12

Yes.

Because you add the digits. 3 + 6 + 2 + 1 = 12

12 is divisible by 3, therefore 3621 is too.

Question 13

Is this number prime?

6732

Why not?

Answer 13

No.

6732 is even. 2 is the only even prime number.

Question 14

What is the definition of a prime number?

Answer 14

A number that has only two factors (1 and itself)

Question 15

Is 29 prime?

Answer 15

Yes

Question 16

List the first 10 prime numbers

Answer 16

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

Question 17

List the first 15 square numbers

Answer 17

1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225

Question 18

List the first 6 cube numbers

Answer 18

1, 8, 27, 64, 125, 216

Question 19

Can you think of two numbers that are both square and prime and less than 100

Answer 19

1 and 64

Question 20

List the first 5 multiples of 7

Answer 20

7, 14, 21, 28, 35

Question 21

List all the factors of 20

Answer 21

1, 20
2, 10
4, 5