Addition and subtraction · Ages 6–7
Addition and subtraction within 18 worksheet
Covers: Add or subtract?, Number bonds to 10 (splitting and making 10), Adding within 10, Zero, Subtracting within 10, Fact families, The equals sign means “the same as”, Doubles, Near doubles, Making ten, Subtracting through ten, Adding 9 and 8, 4 × 4 sudoku
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Addition and subtraction within 18 worksheet
Addition and subtraction · Ages 6–7
Numsprite
numsprite.com
Name:Date:Score:／48
Write each answer in the space. For word problems, show your working and write a sentence answer.
Part A: Working out and filling in (2 marks each)
1.1 + ? = 10
Answer:
2.5 + 3
Answer:
3. − 8 = 0
Answer:
4.7 − 2
Answer:
5.9 + 1 = 10, so 10 − 9 =
Answer:
6.7 + 7
Answer:
7.3 + 2
Answer:
8.8 + 5
Answer:
9.11 − 9
Answer:
10.4 + 8
Answer:
Part B: Choose, or true or false (2 marks each)
11.The top row has 3 more than the bottom row.
True or false?
Answer:
12.5 = 13 − 7
True or false?
Answer:
Part C: Word problems (4 marks each)
13.A car park has 9 spaces and 7 cars are parked in it. How many spaces are still free?
Working:
Answer:
14.Tsz-hin has 4 sweets and 8 chocolates; May has 5 sweets. How many chocolates must May have for the two to have the same number altogether?
Working:
Answer:
15.A pond has 5 white ducks and 4 yellow ducks. How many ducks are on the pond altogether?
Working:
Answer:
16.Ka-yan has 14 pencils and May has 9. How many more pencils does Ka-yan have than May?
Working:
Answer:
17.Ka-yee has saved $7. Mum gives her $9 more. How many dollars does she have now?
Working:
Answer:
18.Every row of a sudoku must have 1, 2, 3 and 4. Ka-lok has written 1 and 2 in a row. What do the two numbers still to go in add up to?
Working:
Answer:
Show the answers and working
Addition and subtraction within 18 worksheet: Answers and working
Part A: Working out and filling in
1. 1 + 9 = 10
1 and 9 make ten, 1 + 9 = 10
2. 5 + 3 = 8
Count on 3 from the bigger number 5: 6, 7, 8, 5 + 3 = 8
3. 8
Subtracting 8 leaves none at all. How many must there have been to begin with?
Taking 8 leaves none, so there were exactly 8.
4. 7 − 2 = 5
Ask "2 plus what makes 7?", 2 + 5 = 7, so it's 5
5. 1
9, 1 and 10 are a family. 9 and which other number make 10?
9, 1 and 10 are a family: 10 minus 9 leaves 1.
6. 7 + 7 = 14
double 7, 7 + 7 = 14
7. 3 + 2 = 5
The numbers are one apart, so double and add one: 2 + 2 = 4, 4 + 1 = 5
8. 8 + 5 = 13
8 is 2 short of ten, so split 5 into 2 and 3: 8 + 2 = 10, 10 + 3 = 13
9. 11 − 9 = 2
Subtract down to ten first: 11 − 1 = 10, then 8 more, 10 − 8 = 2
10. 4 + 8 = 12
Adding 8 is adding 10 and taking 2 back: 4 + 10 = 14, 14 − 2 = 12
Part B: Choose, or true or false
11. True
Pair the two rows one to one and count how many in the top row have no partner.
Paired one to one, the top row has 3 extra: 8 − 5 = 3. Comparing means subtracting, not adding.
12. False
Work out the right side, 13 − 7, first, then compare it with the 5 on the left.
The equals sign says both sides match: the right is 13 − 7 = 6; compare it with 5 on the left.
Part C: Word problems
Marking: 2 for the working, 1 for the answer, 1 for the sentence.
13. A car park has 9 spaces and 7 cars are parked in it. How many spaces are still free? (Answer: 2 spaces)
9 − 7 = 2
14. 7 chocolates
First work out how many Tsz-hin has altogether: 4 + 8. May must have the same.
4 + 8 = 5 + □: the left is 12, and 5 needs 7 more to make 12.
15. A pond has 5 white ducks and 4 yellow ducks. How many ducks are on the pond altogether? (Answer: 9 ducks)
5 + 5, and 1 less; 5 + 4 = 9
16. Ka-yan has 14 pencils and May has 9. How many more pencils does Ka-yan have than May? (Answer: 5 pencils)
14 − 9 = 5
17. Ka-yee has saved $7. Mum gives her $9 more. How many dollars does she have now? (Answer: 16 dollars)
7 + 9 = 16
18. 7
First find which two numbers the row is still missing. Or think what 1 + 2 + 3 + 4 comes to.
The two left are 4 and 3: 4 + 3 = 7. Or take 1 and 2 from 1 + 2 + 3 + 4 = 10.
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