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To solve the problem, first we will use the distributive property on the two numbers:
(60+3)-(30+6)
Now, we will use the substitution property to arrange the exercise in the way that is most convenient for us to solve:
60-30+3-6
It is important to pay attention that when we open the second parentheses, the minus sign moved to the two numbers inside.
30-3 =
27
27
\( 140-70= \)
Breaking numbers like makes subtraction much easier! You can subtract the tens first (60-30=30), then handle the ones separately.
The minus sign distributes to both numbers inside! So becomes . This is super important to remember!
Yes! You can use traditional borrowing or mental math. But breaking it apart helps you understand why subtraction works and makes the calculation clearer.
Rearranging lets you group easier calculations together! and , then .
Add your answer back to the second number: . If you get 63, then 27 is correct! This works because addition and subtraction are opposite operations.
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