If we have 79 blocks in total, how many blocks will remain if we remove 2 tens and 3 ones?
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If we have 79 blocks in total, how many blocks will remain if we remove 2 tens and 3 ones?
Let's solve the problem step by step:
We begin with a total of blocks.
First, we need to determine how many blocks are removed:
Add the blocks removed together: blocks removed in total.
Now, subtract the total blocks removed from the starting total:
Therefore, the number of blocks remaining is .
Add fifty units to the number 31.
What is the resulting number?
Because tens have a different value than ones! Each ten represents 10 blocks, so 2 tens = 20 blocks. You must convert to the same units before subtracting.
In our base-10 number system, tens means groups of 10. So 2 tens = individual blocks.
Think of money! Just like 2 dimes = 20 pennies, 2 tens = 20 ones. Convert everything to the same unit (ones) before calculating.
Add back what you removed: . If you get the original number, your subtraction is correct!
The diagram shows base-10 blocks where long rectangles represent tens and small squares represent ones. This helps you visualize place value concepts.
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