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Use place value, known facts and flexible partitions to add and subtract.
Free examples and worked answers. No account needed.
Practise the method.
Use place value, known facts and flexible partitions to add and subtract.
Use place value, known facts and flexible partitions to add and subtract.
Example 1
Use place value to calculate 215+229.
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Answer: 444
- Partition 229 as 200+20+9.
- Add the hundreds: 215+200=415.
- Add the tens and ones: 415+20+9=444.
Example 2
Calculate 379−231. Use partitioning or regrouping.
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Answer: 148
- Subtract the hundreds, tens and ones, exchanging a larger unit when needed.
- Check by addition: 231+148=379, so 379−231=148.
Example 3
Calculate 382+55 by first making 400.
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Answer: 437
- 382 needs 18 to reach 400.
- Split 55 into 18+37.
- Then 382+18+37=400+37=437.
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