Addition and subtraction · Ages 7–8
Making 100 worksheet
Part of: Three-digit addition and subtraction
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Making 100 worksheet
Addition and subtraction · Ages 7–8
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)
1.82 + ? = 100
Answer:
2.47 + ? = 100
Answer:
3.13 + ? = 100
Answer:
4.56 + ? = 100
Answer:
5.89 + ? = 100
Answer:
6.41 + ? = 100
Answer:
7.27 + ? = 100
Answer:
8.53 + ? = 100
Answer:
9.40 + ? = 100
Answer:
10.93 + ? = 100
Answer:
11.37 + ? = 100
Answer:
12.73 + ? = 100
Answer:
Part B: Word problems (4 marks each)
13.A jigsaw has 100 pieces, and 72 are already in place. How many pieces are still to go in?
Working:
Answer:
14.Ming has $33 and wants to buy a $100 backpack. How many more dollars does he need?
Working:
Answer:
15.Tsz-ching's goal today is 100 skips. She has done 96. How many more skips does she need to reach the goal?
Working:
Answer:
16.Tsz-ching's goal today is 100 skips. She has done 20. How many more skips does she need to reach the goal?
Working:
Answer:
17.A storybook has 100 pages. Ming has read 41 of them. How many pages does he still have to read?
Working:
Answer:
18.A storybook has 100 pages. Ka-lok has read 29 of them. How many pages does he still have to read?
Working:
Answer:
Show the answers and working
Making 100 worksheet: Answers and working
Part A: Working out and filling in
1. 82 + 18 = 100
82 + ? = 100: fill it up in steps, 82 → 90 is 8, 90 → 100 is 10, 8 + 10 = 18
2. 47 + 53 = 100
47 + ? = 100: fill it up in steps, 47 → 50 is 3, 50 → 100 is 50, 3 + 50 = 53
3. 13 + 87 = 100
13 + ? = 100: fill it up in steps, 13 → 20 is 7, 20 → 100 is 80, 7 + 80 = 87
4. 56 + 44 = 100
56 + ? = 100: fill it up in steps, 56 → 60 is 4, 60 → 100 is 40, 4 + 40 = 44
5. 89 + 11 = 100
89 + ? = 100: fill it up in steps, 89 → 90 is 1, 90 → 100 is 10, 1 + 10 = 11
6. 41 + 59 = 100
41 + ? = 100: fill it up in steps, 41 → 50 is 9, 50 → 100 is 50, 9 + 50 = 59
7. 27 + 73 = 100
27 + ? = 100: fill it up in steps, 27 → 30 is 3, 30 → 100 is 70, 3 + 70 = 73
8. 53 + 47 = 100
53 + ? = 100: fill it up in steps, 53 → 60 is 7, 60 → 100 is 40, 7 + 40 = 47
9. 40 + 60 = 100
40 + ? = 100: a whole ten goes straight up, 40 + 60 = 100
10. 93 + 7 = 100
93 + ? = 100: 93 needs 7 to reach 100, 93 + 7 = 100
11. 37 + 63 = 100
37 + ? = 100: fill it up in steps, 37 → 40 is 3, 40 → 100 is 60, 3 + 60 = 63
12. 73 + 27 = 100
73 + ? = 100: fill it up in steps, 73 → 80 is 7, 80 → 100 is 20, 7 + 20 = 27
Part B: Word problems
Marking: 2 for the working, 1 for the answer, 1 for the sentence.
13. A jigsaw has 100 pieces, and 72 are already in place. How many pieces are still to go in? (Answer: 28 pieces)
100 − 72 = 28
14. Ming has $33 and wants to buy a $100 backpack. How many more dollars does he need? (Answer: 67 dollars)
100 − 33 = 67
15. Tsz-ching's goal today is 100 skips. She has done 96. How many more skips does she need to reach the goal? (Answer: 4 skips)
100 − 96 = 4
16. Tsz-ching's goal today is 100 skips. She has done 20. How many more skips does she need to reach the goal? (Answer: 80 skips)
100 − 20 = 80
17. A storybook has 100 pages. Ming has read 41 of them. How many pages does he still have to read? (Answer: 59 pages)
100 − 41 = 59
18. A storybook has 100 pages. Ka-lok has read 29 of them. How many pages does he still have to read? (Answer: 71 pages)
100 − 29 = 71
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