Regroup when subtracting 3-digit numbers
2nd Grade Math practice: Solve 402 - 178.. Part of add and subtract 1000 (Add and Subtract 1000).
~10 min
If a digit is too small, regroup from the next greater place value.
Knowing When to Regroup
342
Th
0
H
3
T
4
O
2
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.