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Grade 3 Quiz: Addition & Subtraction — Easy Version 2
Grade 3 · MathSheets Name: ____________________ Date: __________
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.
How to solve
This quiz mixes questions from different lessons, like a real test. Read each question carefully: the lesson name in front tells you what kind of problem it is. Check your answers, then practise the lessons where you made mistakes.
Example
3-Digit Subtraction with Borrowing: 956 − 418 = 953 − ___
Answer: 415
Not quite. The answer is
💡 Add back what was taken away: 12 + 32 = 44. Check: 44 − 32 = 12.
✓ Correct!
Not quite. The answer is
💡 Add back what was taken away: 12 + 32 = 44. Check: 44 − 32 = 12.
💡 How to solve: Missing Numbers in Addition & Subtraction
Addition and subtraction undo each other. For 250 + ___ = 600, think 600 - 250 = 350, so the missing number is 350. For ___ - 40 = 85, add back: 85 + 40 = 125. Always check by putting your number back in.
Try a similar one
23 + ___ = 50
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Taking away 300 takes away 3 hundreds, so only the hundreds digit goes down: 531 − 300 = 231.
✓ Correct!
Not quite. The answer is
💡 Taking away 300 takes away 3 hundreds, so only the hundreds digit goes down: 531 − 300 = 231.
💡 How to solve: Mental Math: Adding & Subtracting
Use friendly numbers. To add 200, just add 2 to the hundreds digit: 345 + 200 = 545. To add 298, add 300 and then take away 2: 145 + 300 = 445, and 445 - 2 = 443. To make the next hundred, count up: 370 + 30 = 400.
Try a similar one
517 + 100 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Use the rounded numbers: 90 − 80 = 10. So 87 - 77 is about 10.
✓ Correct!
Not quite. The answer is
💡 Use the rounded numbers: 90 − 80 = 10. So 87 - 77 is about 10.
💡 How to solve: Estimating Sums & Differences
To estimate, round each number, then do the easy math. For 348 + 529, round to the nearest hundred: 300 + 500 = 800. So the answer is about 800. Estimating helps you check if an exact answer makes sense.
Try a similar one
Estimate 39 + 55 by rounding each number to the nearest ten.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Ones: 9 − 6 = 3. Tens: 5 is less than 6, so regroup 1 from the hundreds. Now 15 − 6 = 9. Hundreds: the 5 is now 4. 4 − 2 = 2. So 559 − 266 = 293.
✓ Correct!
Not quite. The answer is
💡 Ones: 9 − 6 = 3. Tens: 5 is less than 6, so regroup 1 from the hundreds. Now 15 − 6 = 9. Hundreds: the 5 is now 4. 4 − 2 = 2. So 559 − 266 = 293.
💡 How to solve: 3-Digit Subtraction with Borrowing
Subtract one column at a time, starting with the ones. If the top digit is too small, borrow 1 from the next column. For 403 − 158: 3 is less than 8, and the tens hold 0, so borrow from the hundreds first: 4 hundreds become 3, the tens become 10, then borrow a ten: tens 9, ones 13. Now 13 − 8 = 5, 9 − 5 = 4, 3 − 1 = 2. So 403 − 158 = 245.
Try a similar one
748 − 678 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Ones: 1 + 8 = 9. Tens: 0 + 3 = 3. Hundreds: 2 + 2 = 4. So 201 + 238 = 439.
✓ Correct!
Not quite. The answer is
💡 Ones: 1 + 8 = 9. Tens: 0 + 3 = 3. Hundreds: 2 + 2 = 4. So 201 + 238 = 439.
💡 How to solve: Multi-Digit Addition & Subtraction (Mixed Review)
Line up the ones, tens and hundreds. Work from right to left, carrying when a column adds to 10 or more, and borrowing when the top digit is too small to subtract.
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284 + 346 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Ones: 4 + 0 = 4. Tens: 9 + 8 = 17. Write 7 and carry 1 to the hundreds. Hundreds: 1 + 3 + 1 = 5. So 194 + 380 = 574.
✓ Correct!
Not quite. The answer is
💡 Ones: 4 + 0 = 4. Tens: 9 + 8 = 17. Write 7 and carry 1 to the hundreds. Hundreds: 1 + 3 + 1 = 5. So 194 + 380 = 574.
💡 How to solve: 3-Digit Addition with Regrouping
Add one column at a time, starting with the ones. For 368 + 257: ones 8 + 7 = 15, write 5 and carry 1 ten. Tens 6 + 5 + 1 = 12, write 2 and carry 1 hundred. Hundreds 3 + 2 + 1 = 6. So 368 + 257 = 625.
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125 + 382 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Subtract the part you know from the total: 34 − 18 = 16. Check: 18 + 16 = 34.
✓ Correct!
Not quite. The answer is
💡 Subtract the part you know from the total: 34 − 18 = 16. Check: 18 + 16 = 34.
💡 How to solve: Missing Numbers in Addition & Subtraction
Addition and subtraction undo each other. For 250 + ___ = 600, think 600 - 250 = 350, so the missing number is 350. For ___ - 40 = 85, add back: 85 + 40 = 125. Always check by putting your number back in.
Try a similar one
24 + ___ = 40
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 30 is 3 tens. Count back by tens from 865: 855, 845, 835. So 865 − 30 = 835.
✓ Correct!
Not quite. The answer is
💡 30 is 3 tens. Count back by tens from 865: 855, 845, 835. So 865 − 30 = 835.
💡 How to solve: Mental Math: Adding & Subtracting
Use friendly numbers. To add 200, just add 2 to the hundreds digit: 345 + 200 = 545. To add 298, add 300 and then take away 2: 145 + 300 = 445, and 445 - 2 = 443. To make the next hundred, count up: 370 + 30 = 400.
Try a similar one
159 + 100 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 87 rounds to 90, because the ones digit 7 is 5 or more, so round up. 14 rounds to 10, because the ones digit 4 is less than 5, so round down. Then 90 + 10 = 100. The answer is about 100.
✓ Correct!
Not quite. The answer is
💡 87 rounds to 90, because the ones digit 7 is 5 or more, so round up. 14 rounds to 10, because the ones digit 4 is less than 5, so round down. Then 90 + 10 = 100. The answer is about 100.
💡 How to solve: Estimating Sums & Differences
To estimate, round each number, then do the easy math. For 348 + 529, round to the nearest hundred: 300 + 500 = 800. So the answer is about 800. Estimating helps you check if an exact answer makes sense.
Try a similar one
Estimate 26 + 29 by rounding each number to the nearest ten.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Ones: 4 − 4 = 0. Tens: 3 is less than 4, so regroup 1 from the hundreds. Now 13 − 4 = 9. Hundreds: the 7 is now 6. 6 − 6 = 0. So 734 − 644 = 90.
✓ Correct!
Not quite. The answer is
💡 Ones: 4 − 4 = 0. Tens: 3 is less than 4, so regroup 1 from the hundreds. Now 13 − 4 = 9. Hundreds: the 7 is now 6. 6 − 6 = 0. So 734 − 644 = 90.
💡 How to solve: 3-Digit Subtraction with Borrowing
Subtract one column at a time, starting with the ones. If the top digit is too small, borrow 1 from the next column. For 403 − 158: 3 is less than 8, and the tens hold 0, so borrow from the hundreds first: 4 hundreds become 3, the tens become 10, then borrow a ten: tens 9, ones 13. Now 13 − 8 = 5, 9 − 5 = 4, 3 − 1 = 2. So 403 − 158 = 245.
Try a similar one
624 − 432 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Grade 3 Quiz: Addition & Subtraction — Easy Version 2
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.