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To solve this problem, we'll follow these steps:
Breaking down the addition as described:
1.
2.
Thus, calculating step by step confirms:
Therefore, the expression equivalent to as broken into two components is .
Analyzing the available choices, the correct equivalent is given by choice 3: .
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Breaking 5 into 3 + 2 is strategic because adding 3 to 67 gives us 70, which is a friendly number! Then adding 2 more is super easy. Other combinations like 4 + 1 don't create this helpful stepping stone.
Numbers ending in 0 are friendly numbers because they're easy to work with mentally. When you reach 70, adding 2 more becomes simple: .
Absolutely! For example, with , you could break 7 into 2 + 5 to get . Always look for ways to reach friendly numbers!
Usually decompose the smaller number (like the 5 in this problem). Look at the larger number and think: 'What do I need to add to reach the next friendly number?' That guides your decomposition.
Sometimes there are! For , you could also use . Choose the decomposition that feels easiest for you to calculate mentally.
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