If we have 27 blocks in total and we want to add enough blocks in order that the total number of blocks will be divisible by 10, how many extra blocks must we add?
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If we have 27 blocks in total and we want to add enough blocks in order that the total number of blocks will be divisible by 10, how many extra blocks must we add?
To solve this problem of determining how many blocks need to be added to 27 in order to make it divisible by 10, we will follow these steps:
Let's work through each step:
Step 1: Calculate the remainder:
When we divide 27 by 10, we perform the calculation remainder . This means, .
Step 2: Find how many more blocks are needed:
We want the total to be a multiple of 10. The next multiple of 10 after 27 is 30.
To find how many more blocks we need, we subtract the remainder from 10:
Therefore, we need to add 3 blocks to the current 27 blocks to make the total divisible by 10.
Thus, the number of additional blocks needed is .
If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?
You could, but it's much slower! Using the remainder method gives you the answer instantly. Find the remainder when dividing by 10, then subtract from 10.
Great question! If there's no remainder (like 30 ÷ 10 = 3 remainder 0), then you don't need to add any blocks. The answer would be 0.
Look at the ones digit! For 27, the ones digit is 7. That's your remainder when dividing by 10. So you need more blocks.
Yes! The same principle works for any number. Find the remainder when dividing, then subtract from the divisor. For example, to make 27 divisible by 5: remainder , so add .
The next multiple of 10 after 27 is 30. You can find this by adding the remainder to the original number: .
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