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Adding Three Numbers — Easy Worksheet 2
Grade 1 · Whoobee Name: ____________________ Date: __________
Add the three numbers. Look for a ten or a double first!
How to solve
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Example
2 + 2 + 1 = ___
Answer: 5
Warm-up
Not quite. The answer is
💡 Add the first two: 4 + 1 = 5. Then 5 + 4 = 9. So 4 + 1 + 4 = 9.
✓ Correct!
Not quite. The answer is
💡 Add the first two: 4 + 1 = 5. Then 5 + 4 = 9. So 4 + 1 + 4 = 9.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
4 + 1 + 1 = ___
✓ 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
💡 Add the first two: 4 + 4 = 8. Then 8 + 4 = 12. So 4 + 4 + 4 = 12.
✓ Correct!
Not quite. The answer is
💡 Add the first two: 4 + 4 = 8. Then 8 + 4 = 12. So 4 + 4 + 4 = 12.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
2 + 2 + 1 = ___
✓ 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
💡 Add the first two: 1 + 1 = 2. Then 2 + 1 = 3. So 1 + 1 + 1 = 3.
✓ Correct!
Not quite. The answer is
💡 Add the first two: 1 + 1 = 2. Then 2 + 1 = 3. So 1 + 1 + 1 = 3.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
1 + 4 + 4 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Picture it
Not quite. The answer is
💡 Count each group: 3, 1 and 1 dots. Add the first two: 3 + 1 = 4. Then 4 + 1 = 5. So 3 + 1 + 1 = 5.
✓ Correct!
Not quite. The answer is
💡 Count each group: 3, 1 and 1 dots. Add the first two: 3 + 1 = 4. Then 4 + 1 = 5. So 3 + 1 + 1 = 5.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
1 + 3 + 1 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Think it through
Not quite. The answer is
💡 First 4 + 2 = 6. Now add 4: Start at 6 and count on 4: 7, 8, 9, 10. So 6 + 4 = 10.
✓ Correct!
Not quite. The answer is
💡 First 4 + 2 = 6. Now add 4: Start at 6 and count on 4: 7, 8, 9, 10. So 6 + 4 = 10.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
4 + 2 + 1 = ___
✓ 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
💡 Add the first two: 3 + 3 = 6. Then 6 + 4 = 10. So 3 + 3 + 4 = 10.
✓ Correct!
Not quite. The answer is
💡 Add the first two: 3 + 3 = 6. Then 6 + 4 = 10. So 3 + 3 + 4 = 10.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
1 + 4 + 4 = ___
✓ 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
💡 Put all three groups together. Add the first two: 1 + 2 = 3. Then 3 + 2 = 5. So 1 + 2 + 2 = 5.
✓ Correct!
Not quite. The answer is
💡 Put all three groups together. Add the first two: 1 + 2 = 3. Then 3 + 2 = 5. So 1 + 2 + 2 = 5.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
1 + 1 + 3 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Challenge
Not quite. The answer is
💡 These are the same three numbers in a different order. Changing the order does not change the total, so it is still 8.
✓ Correct!
Not quite. The answer is
💡 These are the same three numbers in a different order. Changing the order does not change the total, so it is still 8.
💡 How to solve: Adding Three Numbers
Add two of the numbers first, then add the third. Pick an easy pair, like two numbers that make 10: for 7 + 4 + 3, add 7 + 3 = 10, then 10 + 4 = 14.
Try a similar one
3 + 3 + 3 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Adding Three Numbers — Easy Worksheet 2
Add the three numbers. Look for a ten or a double first!