This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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It looks like we've already covered the questions under "3 Confirm" and the first two points under "4 Practice" in our previous chat.
Let's focus on the last point:
4 Practice
3) Practice demonstrating the solving of subtraction by using various methods.
Let's demonstrate solving using the 'take away to make a ten' method.
Step 1: Decompose the subtrahend into two parts: one part that, when subtracted from the minuend , results in . We decompose into and . Step 2: Subtract from to reach . Step 3: Subtract the remaining from .
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It looks like we've already covered the questions under "3 Confirm" and the first two points under "4 Practice" in our previous chat.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.