Addition to 20: Interactive Quizzes and Practice Questions

Question 1

What is an easy way to work out 18 + 2 in your head?

Accepted Answer

Add 10 then add 2

Answer

Double 18 then subtract 2

Answer

Subtract 2 from 18 then add 20

Answer

Halve 18 then add 4

Question 2

Count forward to find the answer to 13 + 4:

Accepted Answer

17

Answer

15

Answer

19

Answer

21

Question 3

Is this sentence true or false: 12 + 5 is bigger than 15.

Accepted Answer

True

Answer

False

Question 4

Which mental math trick can you use to add nine plus eight quickly?

Accepted Answer

Add ten and then subtract two

Answer

Split nine into four and five and then add

Answer

Use your fingers to count

Question 5

Which of these is NOT a strategy for adding two one-digit numbers?

Accepted Answer

Multiplying the numbers

Answer

Counting on

Answer

Using a number line

Question 6

True or False: Ten plus zero equals ten.

Accepted Answer

True

Answer

False

Question 7

To find the sum of 7 and 5, which number do we add to 7?

Accepted Answer

5

Answer

2

Answer

3

Answer

4

Question 8

Which of these number sentences shows how to add 9 and 4?

Accepted Answer

4 + 9 = 13

Answer

13 - 9 = 4

Answer

9 x 4 = 36

Answer

4 - 9 = -5

Question 9

Use the number line to find the sum of 9 and 5.

Accepted Answer

14

Answer

12

Answer

16

Answer

18

Question 10

Which number sentence shows the sum of 5 and 3?

Accepted Answer

5 + 3 = 8

Answer

9 + 4 = 14

Answer

7 + 6 = 12

Answer

10 + 2 = 13

Question 11

Find the sum of 15 and 3 by counting on.

Accepted Answer

18

Answer

17

Answer

19

Question 12

What is the missing number in this addition equation: 12 + _ = 18?

Accepted Answer

6

Answer

4

Answer

8

Question 13

Sam has 13 marbles. He finds 5 more marbles. How many marbles does Sam have in total?

Accepted Answer

18

Answer

16

Answer

20

Question 14

True or False: 14 plus 6 is the same as 6 plus 14.

Accepted Answer

True

Answer

False

Question 15

A farmer has 12 chickens. He buys 6 more. How many chickens does he now have?

Accepted Answer

18

Answer

6

Answer

12

Answer

24

Question 16

Which of these is NOT a good way to add two numbers?

Accepted Answer

Using a calculator

Answer

Counting on

Answer

Drawing a picture

Answer

Estimating

Question 17

Which sum shows the opposite of 12 + 5 = 17?

Accepted Answer

17 - 5 = 12

Answer

17 - 12 = 5

Answer

12 - 5 = 17

Answer

5 - 12 = 17

Question 18

Which expression shows the addition of 8 and 7?

Accepted Answer

8 + 7

Answer

7 - 8

Answer

7 ÷ 8

Answer

8 x 7

Question 19

Which of these is NOT a way to add two one-digit numbers?

Accepted Answer

Subtraction

Answer

Mental math tricks

Answer

Counting on

Answer

Using a number line

Question 20

Estimate the sum of 18 and 12.

Accepted Answer

30

Answer

40

Answer

20

Question 21

What is the sum of 7 plus 9?

Accepted Answer

16

Answer

14

Answer

18

Answer

13

Question 22

Which of these is the addition equation for 6 and 8?

Accepted Answer

6 + 8 = 14

Answer

8 + 7 = 15

Answer

8 - 6 = 14

Answer

6 + 6 = 12

Question 23

Which of these is NOT a strategy for adding two one-digit numbers?

Accepted Answer

Division

Answer

Mental math tricks

Answer

Using a number line

Answer

Counting on

Question 24

What's the total number of crayons if you have 12 crayons and find 5 more?

Accepted Answer

17

Answer

15

Answer

19

Answer

13

Question 25

What is the sum of 14 and 4?

Accepted Answer

18

Answer

12

Answer

20

Answer

16

Question 26

Estimate the sum of 18 and 7 by rounding to the nearest 10.

Accepted Answer

20

Answer

30

Answer

40

Answer

10

Question 27

Which of the following is NOT a valid strategy for adding two-digit numbers?

Accepted Answer

Adding the digits separately

Answer

Chunking

Answer

Expanded form

Answer

Compensation

Question 28

Which addition fact shows the commutative property of addition?

Accepted Answer

5 + 7 = 7 + 5

Answer

5 + 0 = 0 + 5

Answer

5 + 1 = 6

Answer

5 + 5 = 10

Question 29

Use a number line to find the sum of 15 and 3.

Accepted Answer

18

Answer

16

Answer

20

Question 30

Which of these is a valid strategy for adding two numbers?

Accepted Answer

Counting on

Answer

Division

Answer

Subtraction

Answer

Multiplication

Question 31

What is the mathematical expression for adding the numbers 12 and 8?

Accepted Answer

12 + 8

Answer

12 - 8

Answer

8 + 12

Question 32

Which of these is NOT a good way to check your answer to an addition sum?

Accepted Answer

Subtracting the smaller number from the larger

Answer

Estimating

Answer

Counting on

Answer

Using a number line

Question 33

Use a number line to calculate 12 + 5.

Accepted Answer

17

Answer

15

Answer

16

Question 34

Find the sum of 15 and the smallest two-digit number.

Accepted Answer

35

Answer

36

Answer

34

Question 35

Which addition equation has a sum greater than 20?

Accepted Answer

16 + 6

Answer

15 + 4

Answer

12 + 7

Answer

14 + 5

Question 36

What is the missing number in the addition equation: 12 + ? = 18?

Accepted Answer

6

Answer

7

Answer

8

Answer

4

Question 37

Which of the following equations has a sum greater than 20?

Accepted Answer

15 + 7

Answer

18 - 5

Answer

17 - 4

Answer

12 + 6

Question 38

If you add 4 to a number and the result is 13, what is the number?

Accepted Answer

9

Answer

11

Answer

15

Answer

7

Question 39

What is 7 plus 9?

Accepted Answer

16

Answer

18

Answer

14

Answer

12

Question 40

What is 9 plus 6?

Accepted Answer

15

Answer

13

Answer

18

Answer

3

Question 41

Which number sentence shows 12 plus 5?

Accepted Answer

12 + 5 = 17

Answer

12 + 5 = 6

Answer

12 + 5 = 12

Answer

12 + 5 = 7

Question 42

If you count up from 6, what number comes after 10?

Accepted Answer

11

Answer

9

Answer

12

Answer

13

Question 43

Which picture shows 4 plus 5?

Accepted Answer

A picture showing 4 objects and 5 objects together.

Answer

A picture showing 4 objects only.

Answer

A picture showing 5 objects only.

Question 44

What is 10 plus 10?

Accepted Answer

20

Answer

11

Answer

100

Answer

10

Question 45

Which number sentence is the same as 7 plus 3?

Accepted Answer

3 + 7

Answer

10 + 3

Answer

10 - 3

Answer

7 - 3

Question 46

There are 9 red balls and 8 blue balls in a box. How many balls are there in total?

Accepted Answer

17

Answer

20

Answer

10

Answer

1

Question 47

What do you get when you add 11 and 9?

Accepted Answer

20

Answer

2

Answer

10

Answer

19