Addition and subtraction · Ages 7–8
Three-digit addition and subtraction without carrying or borrowing worksheet
Part of: Three-digit addition and subtraction
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Three-digit addition and subtraction without carrying or borrowing worksheet
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.
Part A: Working out and filling in (2 marks each)
1.500 − 100 =
Answer:
2.300 + 100 =
Answer:
3.628 + 200 =
Answer:
4.273 + 400 =
Answer:
5.300 − 100 =
Answer:
6.Round 41 and 25 to the nearest ten, then estimate 41 + 25. About how much is it?
Answer:
7.658 − 214 =
Answer:
8.134 + 415 =
Answer:
9.132 + 801: hundreds with hundreds make hundreds, tens with tens tens, ones with ones ones, so the answer is .
Fill in each blank
Answer:
10.581 + 116: hundreds with hundreds make hundreds, tens with tens tens, ones with ones ones, so the answer is .
Fill in each blank
Answer:
11.Round 935 and 743 to the nearest hundred, then estimate 935 − 743. About how much is it?
Answer:
Part B: Choose, or true or false (2 marks each)
12.501 + 424 = 935
True or false?
Answer:
Part C: Word problems (4 marks each)
13.A library has 417 Chinese books and 432 English books. How many books does it have in all?
Working:
Answer:
14.Tsz-hin has saved 575 dollars and gets 300 dollars in birthday money, all put in the money box. How many dollars are in it now?
Working:
Answer:
15.Ming has 452 stamps, 43 fewer than Ka-yee. How many stamps does Ka-yee have?
Working:
Answer:
16.In a contest the red team scores 664 points and the blue team 222. How many more points does the red team score?
Working:
Answer:
17.A cinema lets in 381 people this morning and 191 this afternoon. Round each number to the nearest hundred and estimate: about how many people come in all day?
Working:
Answer:
18.A ferry carries 669 passengers and 20 crew. At the pier 653 passengers get off; the crew all stay on board. How many passengers are still on the ferry?
Working:
Answer:
Show the answers and working
Three-digit addition and subtraction without carrying or borrowing worksheet: Answers and working
Part A: Working out and filling in
1. 400
500 is 5 hundreds and 100 is 1 hundreds. How many hundreds are left after taking one from the other?
5 hundreds minus 1 hundreds leaves 4 hundreds, which is 400.
2. 400
300 is 3 hundreds and 100 is 1 hundreds. How many hundreds is that in all?
3 hundreds and 1 hundreds make 4 hundreds, which is 400.
3. 828
Adding whole hundreds only changes the hundreds. Work out 6 + 2; leave the tens and ones alone.
Adding whole hundreds changes only the hundreds: 6 + 2 = 8; the tens and ones stay, so 828.
4. 673
Adding whole hundreds only changes the hundreds. Work out 2 + 4; leave the tens and ones alone.
Adding whole hundreds changes only the hundreds: 2 + 4 = 6; the tens and ones stay, so 673.
5. 200
300 is 3 hundreds and 100 is 1 hundreds. How many hundreds are left after taking one from the other?
3 hundreds minus 1 hundreds leaves 2 hundreds, which is 200.
6. 70
Look at the ones: 5 or more, the tens go up 1; 4 or less, they stay. The ones become 0; then add the two whole tens.
41 is about 40 and 25 about 30 (ones of 5 or more round up, 4 or less round down): 40 + 30 = 70.
7. 444
Every place is big enough, so start with the hundreds: 6 minus 2, then do the tens and ones.
Every place is big enough, so subtract hundreds, tens and ones in turn: 658 − 214 = 444. Check: 444 + 214 = 658.
8. 549
No place adds up to 10, so add each place in turn. Start with the hundreds digits: 1 and 4.
No place makes 10, so add hundreds, tens and ones in turn: 134 + 415 = 549.
9. 9, 3, 3, 933
Split 132 and 801 into hundreds, tens and ones, then add each place to its own.
1 + 8 = 9 hundreds, 3 + 0 = 3 tens, 2 + 1 = 3 ones, together 933.
10. 6, 9, 7, 697
Split 581 and 116 into hundreds, tens and ones, then add each place to its own.
5 + 1 = 6 hundreds, 8 + 1 = 9 tens, 1 + 6 = 7 ones, together 697.
11. 200
To round to the nearest hundred, look at the tens: 5 or more, the hundreds go up 1; 4 or less, they stay. The tens and ones become 0.
Look at the tens: 935 is about 900 and 743 about 700 (tens of 5 or more round up): 900 − 700 = 200.
Part B: Choose, or true or false
12. False
Add it yourself place by place, hundreds, tens and ones, then compare with 935.
Hundreds, tens and ones each with its own: 501 + 424 = 925.
Part C: Word problems
Marking: 2 for the working, 1 for the answer, 1 for the sentence.
13. 849 books
Putting the two kinds together means adding. Add hundreds, tens and ones, each with its own.
Putting together means adding, place by place: 417 + 432 = 849.
14. 875 dollars
300 is 3 hundreds. Adding it only changes the hundreds; the tens and ones stay.
Adding whole hundreds changes only the hundreds: 575 + 300 = 875.
15. 495 stamps
Who has more? Ming has fewer than Ka-yee, so Ka-yee has more. To find the bigger one, do you add or subtract?
Ming has fewer, so Ka-yee has 43 more: add, 452 + 43 = 495.
16. 442 points
“How many more” is comparing: take the smaller from the bigger, 664 − 222.
How many more is a subtracting: 664 − 222 = 442.
17. 600 people
Look at the tens: 5 or more, the hundreds go up 1; 4 or less, they stay. Round first, then add.
381 is about 400 and 191 about 200: 400 + 200 = 600, about 600 people.
18. 16 passengers
First check what is asked: only the passengers. Which number has nothing to do with them?
Only the passengers are asked about, so the 20 crew aren't needed: 669 − 653 = 16.
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