If we have 45 blocks in total and we remove 7 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 45 blocks in total and we remove 7 of those blocks, how many blocks remain?
Remember you can break down a row of 10 blocks into single units.
To solve this problem, we'll adhere to a few simple steps:
Now, let's perform the calculation:
The difference between and can be found by performing the subtraction:
.
Therefore, after removing blocks from blocks, the number of blocks remaining is .
Thus, the solution to the problem is .
If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?
You only need to break down blocks when you don't have enough single units to subtract from. In this problem, since we're subtracting 7 from 45, we can do it directly without breaking down any groups of 10.
Think of 45 as 4 complete rows of 10 blocks plus 5 individual blocks. This gives you 40 + 5 = 45 total blocks to work with.
Then you'd need to 'borrow' by breaking down one group of 10 into 10 individual blocks. For example, if you had 32 blocks and needed to subtract 8, you'd break down one group of 10.
Add your answer back to what you subtracted: . If you get the original number, your subtraction was correct!
38 is correct because 45 - 7 = 38. The other answers come from common mistakes: 35 might come from 45 - 10, and 47 might come from adding instead of subtracting.
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