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Mental Four-Digit Addition
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Mental Four-Digit Addition
Use mental strategies to add. You can remove the two zeros, add the remaining numbers, then multiply by 100. Show your thinking where asked.
Add Mentally
Work out each sum. Think about the hundreds in each number.
1.3,600 + 2,800 =
2.5,400 + 3,200 =
3.7,300 + 1,500 =
4.4,700 + 2,600 =
5.2,900 + 4,800 =
6.6,500 + 2,700 =
Explain Your Thinking
Show how place value helps you add these numbers mentally.
7.Work out 4,600 + 3,700 by removing the zeros first. Write the smaller addition and then the full answer.
8.Which calculation is a useful first step for finding 5,800 + 2,400 mentally?
- 58 + 24
- 580 + 240
- 5 + 2
- 58 + 240
9.Match each addition with its total.
- 3,500 + 4,200
- 6,100 + 2,800
- 4,600 + 3,100
- 5,700 + 3,200
- 7,700
- 8,900
- 7,700
- 8,900
10.In your own words, explain why you can add 62 and 19 first when working out 6,200 + 1,900.
Challenge
Think carefully about regrouping hundreds.
11.Find the total of 3,800 + 5,700. Show a mental step that makes the addition easier.
12.Write your own four-digit addition problem that can be solved mentally. Give its answer and describe the strategy you used.
3 printable pages
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Page 2
Page 3
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