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To solve , we can simplify the calculation by using a breakdown approach. Let's follow the steps:
The correct expression that represents this process is , which simplifies to .
The given choices allow us to express the original problem differently. The choice that correctly represents our breakdown is:
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Breaking 7 into 5+2 makes the math easier because 15+5=20, which is a round number! Then 20+2=22 is simple. Other splits like 4+3 or 6+1 don't create such friendly calculations.
No! This is just one helpful strategy. You can add 15+7 directly if you're comfortable with it. Use whatever method feels easiest and most accurate for you.
Usually break apart the smaller number to create round numbers with the larger one. Here, breaking 7 lets us make 15+5=20, which is much easier than breaking 15.
If your decomposed answer doesn't match the direct addition, check your arithmetic! Make sure 15+5+2 really equals 22, and that you split the original number correctly.
Absolutely! This works great with larger numbers. For example, 47+8 becomes 47+3+5 = 50+5 = 55. Look for ways to make round numbers in your calculations.
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