Regroup when subtracting 3-digit numbers

~10 min

If a digit is too small, regroup from the next greater place value.

Knowing When to Regroup

342
3 hundreds
4 tens
2 ones

When subtracting, if the top digit in a column is smaller than the bottom digit, you must regroup from the next place value.

💡 Think of regrouping as 'trading' to get more of what you need.