If we have 27 blocks in total and we remove 18 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 27 blocks in total and we remove 18 of those blocks, how many blocks remain? Remember you can break down a row of 10 blocks into single units.
To solve this problem, begin by employing the basic subtraction formula:
Perform the subtraction:
.
Therefore, the number of blocks remaining after removing 18 from 27 is .
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
You absolutely can! But understanding place value (2 tens + 7 ones) makes subtraction easier and prepares you for larger numbers. Both methods give the same answer.
Break apart a ten-block when you don't have enough individual units to subtract from. In this problem, you have 7 ones but need to subtract 8 ones from 18.
Start by removing as many complete ten-blocks as possible (remove 1 ten-block for 10 of the 18). Then remove individual ones for the remaining amount.
Try the standard algorithm: . Since 7 < 8, borrow from the tens place: , and .
Add back method: ✓ Or count remaining blocks: You should see exactly 9 blocks left in the diagram.
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