Addition and subtraction · Ages 6–7

Fact families worksheet

Part of: Addition and subtraction within 18

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Addition and subtraction · Ages 6–7

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Write each answer in the space. For word problems, show your working and write a sentence answer.

1.7 + 6 = 6 +
Answer:
2.1 + 6 = 7, so 7 − 1 =
Answer:
3.7 + 5 = 5 +
Answer:
4.6 + 5 = 11, so 11 − 6 =
Answer:
5.The family of 9, 7 and 16: 9 + 7 = 16, 7 + 9 = , 16 − 9 = , 16 − 7 =
Fill in each blank
Answer:
6.The family of 3, 9 and 12: 3 + 9 = 12, 9 + 3 = , 12 − 3 = , 12 − 9 =
Fill in each blank
Answer:

13.Ka-lok has $15, buys a $7 picture book and works out $8 is left. Ka-lok checks by adding: 8 + 7 =
Working:
Answer:
14.Ka-yan puts in 8 beads, then 3 more: 11 in all. May puts in 3 beads, then 8 more. How many beads does May put in?
Working:
Answer:
15.Chi-keung has some marbles, buys 9 more and now has 11. How many did Chi-keung have at first?
Working:
Answer:
16.A box has 17 cookies. Ka-yan takes some and 8 are left. How many did Ka-yan take?
Working:
Answer:
17.Chi-keung has some cards, buys 4 more and now has 16. How many did Chi-keung have at first?
Working:
Answer:
18.May has $14, buys a $5 picture book and works out $9 is left. May checks by adding: 9 + 5 =
Working:
Answer:

Show the answers and working

Fact families worksheet: Answers and working

1. 7
Both sides have 6. If you swap the two numbers in an addition, does the answer change?
Swap the two numbers of an addition and the answer stays the same: 7 + 6 = 6 + 7.
2. 6
1, 6 and 7 are a family. 1 and which other number make 7?
1, 6 and 7 are a family: 7 minus 1 leaves 6.
3. 7
Both sides have 5. If you swap the two numbers in an addition, does the answer change?
Swap the two numbers of an addition and the answer stays the same: 7 + 5 = 5 + 7.
4. 5
6, 5 and 11 are a family. 6 and which other number make 11?
6, 5 and 11 are a family: 11 minus 6 leaves 5.
5. 16, 7, 9
Swapping an addition keeps its answer; each subtraction takes one of the numbers away from 16.
Both additions make 16; 16 minus one of them leaves the other.
6. 12, 9, 3
Swapping an addition keeps its answer; each subtraction takes one of the numbers away from 12.
Both additions make 12; 12 minus one of them leaves the other.

7. True
Check by adding: put 7 and 9 together and see whether you get 16.
Check: 7 + 9 = 16, so 16 − 9 = 7.
8. A. 15 − 8 = 7
A family uses only 7, 8 and 15. First rule out the sentences that use any other number.
15 minus 8 leaves 7: 15 − 8 = 7.
9. False
Check by adding: put 5 and 7 together and see whether you get 13.
Check: 6 + 7 = 13, so 13 − 7 = 6.
10. C. 14 − 9 = 5
A family uses only 5, 9 and 14. First rule out the sentences that use any other number.
14 minus 9 leaves 5: 14 − 9 = 5.
11. True
Check by adding: put 7 and 3 together and see whether you get 10.
Check: 7 + 3 = 10, so 10 − 3 = 7.
12. B. 4 + 8 = 8 + 4
An addition can be swapped, but can a subtraction? Check each one: are both sides really the same?
An addition can be swapped and keep its answer; a subtraction can't.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 15
Checking means adding the $8 left to the $7 spent.
To check, what is left plus what was spent must make the $15 at the start.
14. 11 beads
Both put in 8 and 3 beads, just in a different order. Does swapping the order change the total?
Swapping the order keeps the answer: 3 + 8 = 8 + 3 = 11.
15. 2 marbles
The first number with 9 more makes 11. So work backwards: take 9 away from 11.
The first number plus 9 is 11, so the first number is 11 − 9 = 2.
16. 9 cookies
What was taken and the 8 left make 17 together. Think how many more 8 needs to make 17.
17, 8 and the number taken are a family: 17 − 8 = 9, because 9 + 8 = 17.
17. 12 cards
The first number with 4 more makes 16. So work backwards: take 4 away from 16.
The first number plus 4 is 16, so the first number is 16 − 4 = 12.
18. 14
Checking means adding the $9 left to the $5 spent.
To check, what is left plus what was spent must make the $14 at the start.

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