Work it out one column at a time.

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Ready to practise carrying and borrowing?Robo will show you what to do, and why.
1. STARTBegin at the ones.
2. COUNTAdd or subtract.
3. TRADECarry or borrow if needed.
4. WRITEWrite the digit.

1Choose the operation

2Choose the number size

3Choose how much help you want

4Choose the number of questions