Addition and subtraction · Ages 7–8
Three-digit addition and subtraction worksheet
Covers: Three-digit addition and subtraction without carrying or borrowing, Three-digit + and −, Adding three numbers in a chain, Adding in a handy order, Subtracting twice, Adding and subtracting together, Making 100, Giving change
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Three-digit addition and subtraction 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)
1.259 + 200 =
Answer:
2.920 − 400
Answer:
3.475 − 336
Answer:
4.486 + 20 + 143 =
Answer:
5.346 + + 159 = 547
Answer:
6.155 + 40 + 145 =
Answer:
7.733 − − 166 = 451
Answer:
8.56 − 20 + 34 =
Answer:
9.28 + ? = 100
Answer:
10.Ball $22, pay $50, change $?
Answer:
Part B: Choose, or true or false (2 marks each)
11.323 + 225 = 648
True or false?
Answer:
12.To work out 89 + 237 + 211, which two numbers are handiest to add first?
- A. 89 and 211
- B. 237 and 211
- C. You must add left to right
- D. 89 and 237
Choose the right answer
Answer:
Part C: Word problems (4 marks each)
13.A cinema lets in 416 people this morning and 211 this afternoon. Round each number to the nearest hundred and estimate: about how many people come in all day?
Working:
Answer:
14.Ka-yee buys a $293 rucksack, a $233 pair of trainers and a $85 storybook. How much is that in all?
Working:
Answer:
15.Tsz-ching has 435 stickers. Chi-keung gives Tsz-ching 55 more, and Tsz-hin gives Tsz-ching another 45. How many stickers does Tsz-ching have now?
Working:
Answer:
16.Tsz-ching has 235 cards, and Tsz-hin has 23 fewer than Tsz-ching. Tsz-hin gives 77 to a friend. How many cards does Tsz-hin have left?
Working:
Answer:
17.Tsz-ching has 364 stickers. Ka-lok has 80 more than Tsz-ching, and May has 73 fewer than Ka-lok. How many stickers does May have?
Working:
Answer:
18.Ka-yan buys a pen for $15 and a storybook for $20, and pays with a $100 note. How much change should she get, in dollars?
Working:
Answer:
Show the answers and working
Three-digit addition and subtraction worksheet: Answers and working
Part A: Working out and filling in
1. 459
Adding whole hundreds only changes the hundreds. Work out 2 + 2; leave the tens and ones alone.
Adding whole hundreds changes only the hundreds: 2 + 2 = 4; the tens and ones stay, so 459.
2. 920 − 400 = 520
920 − 400: left to right, subtract one place at a time: hundreds 920 − 400 = 520
3. 475 − 336 = 139
475 − 336: left to right, subtract one place at a time: hundreds 475 − 300 = 175, tens 175 − 30 = 145, ones 145 − 6 = 139
4. 649
Add from left to right: 486 + 20 first, then add 143.
Left to right: 486 + 20 = 506, 506 + 143 = 649.
5. 42
Add the two you know, 346 and 159, first, then see how much more is needed to reach 547.
346 and 159 make 505, and 547 − 505 = 42.
6. 340
Look for the two numbers whose ones make 10: together they make a whole hundred. Add those first.
Add 155 and 145 first to make 300; 300 + 40 = 340.
7. 116
733 minus □ and 166 leaves 451. Start by working out 733 minus 166.
733 minus □ and 166 leaves 451: 733 − 166 = 567, and 567 − 451 = 116.
8. 70
With both + and −, go left to right. Start with 56 − 20.
Left to right: 56 − 20 = 36, 36 + 34 = 70.
9. 28 + 72 = 100
28 + ? = 100: fill it up in steps, 28 → 30 is 2, 30 → 100 is 70, 2 + 70 = 72
10. Ball $22, pay $50, change $28
$22, paying $50: count up from the price, $22 → $30 is $8, $30 → $50 is $20, 8 + 20 = 28, so $28 change
Part B: Choose, or true or false
11. False
Add it yourself place by place, hundreds, tens and ones, then compare with 648.
Hundreds, tens and ones each with its own: 323 + 225 = 548.
12. A. 89 and 211
Check the ones of each pair: which two make 10, so the pair makes a whole hundred?
The ones of 89 and 211 make 10 and the two make a whole hundred, so add them first.
Part C: Word problems
Marking: 2 for the working, 1 for the answer, 1 for the sentence.
13. 600 people
Look at the tens: 5 or more, the hundreds go up 1; 4 or less, they stay. Round first, then add.
416 is about 400 and 211 about 200: 400 + 200 = 600, about 600 people.
14. 611 dollars
Add up the three prices. Go left to right, starting with 293 + 233.
293 + 233 + 85 = 611.
15. 535 stickers
What do Chi-keung's 55 and Tsz-hin's 45 make together? Add those two first.
55 + 45 = 100, so 435 + 100 = 535.
16. 135 cards
First work out how many Tsz-hin had: 23 fewer than Tsz-ching's 235.
Then subtract the 77 that Tsz-hin gives away.
Tsz-hin has 235 − 23 = 212; 212 − 77 = 135.
17. 371 stickers
First work out Ka-lok's stickers: 80 more than Tsz-ching's 364.
Then May's: 73 fewer than Ka-lok's.
Ka-lok has 364 + 80 = 444; May has 444 − 73 = 371.
18. Ka-yan buys a pen for $15 and a storybook for $20, and pays with a $100 note. How much change should she get, in dollars? (Answer: 65 dollars)
100 − (15 + 20) = 65
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