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Missing Numbers in Addition & Subtraction — Easy Worksheet 1
Grade 3 · MathSheets Name: ____________________ Date: __________
Find the missing number. Check by putting it back into the equation.
How to solve
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.
Example
40 + ___ = 66
Answer: 26
✓ Correct!
Not quite. The answer is
💡 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
55 + ___ = 80
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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 + ___ = 61
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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
45 + ___ = 81
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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
42 + ___ = 72
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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
60 + ___ = 84
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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
55 + ___ = 87
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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 + ___ = 47
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 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
17 + ___ = 43
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Missing Numbers in Addition & Subtraction — Easy Worksheet 1
Find the missing number. Check by putting it back into the equation.