If we have 34 blocks in total and we remove 16 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 34 blocks in total and we remove 16 of those blocks, how many blocks remain? Remember you can break down a row of 10 blocks into single units.
First, we start with the total number of blocks, which is .
We need to remove blocks from this total. Therefore, we perform the subtraction:
.
Let's break this down:
is composed of tens (i.e., ) and ones.
Subtracting means subtracting ten and from these blocks.
First, subtract from , which leaves us with . Then, subtract from , giving:
.
Therefore, after removing blocks, we are left with blocks.
The solution to the problem is .
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
When you break down or regroup, you're trading 1 ten-block for 10 individual unit blocks. It's like trading a 1 bills - the value stays the same!
You can't take away 6 things when you only have 4! That's why we regroup - we borrow 1 ten (which equals 10 ones) so we have 14 ones instead of 4 ones.
You need to regroup when the bottom digit is larger than the top digit in any place value. In 34 - 16, since 6 > 4 in the ones place, we must regroup.
After borrowing 1 ten for the ones place, we have one less ten in the tens place. So 3 tens becomes 2 tens, and 4 ones becomes 14 ones.
Absolutely! Base-10 blocks and regrouping work for any subtraction problem. You might have hundreds blocks, thousands blocks, and so on - the same principle applies!
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