If we have 46 blocks in total and we remove 27 of those blocks, how many blocks remain? Remember you can break down a row of 10 blocks into single units.
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If we have 46 blocks in total and we remove 27 of those blocks, how many blocks remain? Remember you can break down a row of 10 blocks into single units.
To solve this problem, let's follow a step-by-step approach using subtraction with regrouping:
Thus, the remaining number of blocks after removing 27 from 46 is .
If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?
That would give you the wrong answer! You must respect place value. When the top digit is smaller, you need to regroup (borrow) from the next column first.
Base-10 blocks make regrouping visual! You can literally break apart one ten-block into 10 unit blocks, showing how 4 tens 6 ones becomes 3 tens 16 ones.
It means trading one ten-block for 10 individual unit blocks. This lets you have enough units to subtract from when the ones digit is too small.
Use addition to check: your answer plus the number you subtracted should equal your starting number. ✓
The same rule applies! Borrow from the left whenever needed. Each borrowed digit becomes 10 in the next place value down.
Absolutely! Regrouping works for any subtraction problem, no matter how many digits. The process stays the same: borrow from left to right as needed.
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