Addition and subtraction · Ages 7–8

Adding in a handy order worksheet

Part of: Three-digit addition and subtraction

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Addition and subtraction · Ages 7–8

Numsprite
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Name:Date:Score:／48

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

13.Chi-keung buys a $57 pen, a $410 backpack and a $43 box of coloured pencils. How much is that in all?
Working:
Answer:
14.Ka-yan has 442 stickers. Tsz-hin gives Ka-yan 72 more, and Ming gives Ka-yan another 28. How many stickers does Ka-yan have now?
Working:
Answer:
15.A car park has three floors: 192 cars on the first, 45 on the second and 108 on the third. How many cars are parked in all?
Working:
Answer:
16.Tsz-hin buys a $78 pen, a $260 backpack and a $22 box of coloured pencils. How much is that in all?
Working:
Answer:
17.A car park has three floors: 114 cars on the first, 119 on the second and 86 on the third. How many cars are parked in all?
Working:
Answer:
18.Ka-yan has 276 stickers. Tsz-ching gives Ka-yan 77 more, and Tsz-hin gives Ka-yan another 23. How many stickers does Ka-yan have now?
Working:
Answer:

Show the answers and working

Adding in a handy order worksheet: Answers and working

1. 313
Both sides have 54. Does changing the order of an addition change the answer?
Adding works in any order: 313 + 54 = 54 + 313.
2. 343
See which two numbers make exactly 100 together, and add those first.
Add 88 and 12 first to make 100; 243 + 100 = 343.
3. 210
See which two numbers make exactly 100 together, and add those first.
Add 19 and 81 first to make 100; 110 + 100 = 210.
4. 682
Both sides have 67. Does changing the order of an addition change the answer?
Adding works in any order: 682 + 67 = 67 + 682.
5. 400, 491
The ones of 164 and 236 make 10. Add those two first and see if they make a whole hundred.
Add 164 and 236 first to make 400; 91 + 400 = 491.
6. 440
Look for the two numbers whose ones make 10: together they make a whole hundred. Add those first.
Add 311 and 89 first to make 400; 400 + 40 = 440.
7. 279
Look for the two numbers whose ones make 10: together they make a whole hundred. Add those first.
Add 175 and 25 first to make 200; 200 + 79 = 279.
8. 300, 340
The ones of 117 and 183 make 10. Add those two first and see if they make a whole hundred.
Add 117 and 183 first to make 300; 40 + 300 = 340.

9. A. 63 and 237
Check the ones of each pair: which two make 10, so the pair makes a whole hundred?
The ones of 63 and 237 make 10 and the two make a whole hundred, so add them first.
10. C. 81 and 219
Check the ones of each pair: which two make 10, so the pair makes a whole hundred?
The ones of 81 and 219 make 10 and the two make a whole hundred, so add them first.
11. False
Changing the order is fine, but the three numbers must be exactly the same. Compare each one on both sides.
Adding works in any order, but only if the right side has exactly the same three numbers as the left.
12. False
Changing the order is fine, but the three numbers must be exactly the same. Compare each one on both sides.
Adding works in any order, but only if the right side has exactly the same three numbers as the left.

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

13. 510 dollars
See which two prices make exactly $100 together, and add those first.
First 57 + 43 = 100, then add 410: 510.
14. 542 stickers
What do Tsz-hin's 72 and Ming's 28 make together? Add those two first.
72 + 28 = 100, so 442 + 100 = 542.
15. 345 cars
The ones of 192 and 108 make 10, so together they make a whole hundred. Add those first.
Add 192 + 108 first to make a whole hundred, then 45: 345.
16. 360 dollars
See which two prices make exactly $100 together, and add those first.
First 78 + 22 = 100, then add 260: 360.
17. 319 cars
The ones of 114 and 86 make 10, so together they make a whole hundred. Add those first.
Add 114 + 86 first to make a whole hundred, then 119: 319.
18. 376 stickers
What do Tsz-ching's 77 and Tsz-hin's 23 make together? Add those two first.
77 + 23 = 100, so 276 + 100 = 376.

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