Use the above equation to help solve the following problem:
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Use the above equation to help solve the following problem:
To solve , notice that it can be related to by adding one to each of the constituent numbers . This can be expressed as:
.
Breaking it down, we have:
Thus, the total becomes:
.
Therefore, the sum of is .
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Because both numbers changed from 40 to 41! When you have , you're adding two numbers that each increased by 1, so you need to add to the original sum.
This decomposition method works for any addition! Break each number into parts: . Try it with !
Yes! Once you understand the pattern, you can think: "Each number went up by 1, so the sum goes up by 2." So directly!
Great question! You'd still use the same approach: . Break the harder number into known parts plus extras.
You can always add directly: by counting or using column addition. Both methods should give you 82 - if they don't match, recheck your work!
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