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To solve this problem, we can use the technique of breaking down numbers for easier mental addition.
Step 1: We start with the expression .
Step 2: We can decompose the number 8 into two numbers that are easier to add in parts. A simple break down is .
Step 3: We substitute the breakdown into the original expression:
Thus, the expression is equivalent to , giving us the correct answer.
Therefore, the correct equivalent expression is .
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
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