Answer:
Making tens is an strategy to help student to subtract using this number.
So, we could subtract 12-2 = 10. Now, to fins 12-4, we have to also find the way to transform the ten into 8, because 12-4=8. So, basically, by subtracting 2 units one more time we can get the 8 or 12-4; 10-2=8, and 12-4=8, therefore 10-2=12-4, which is true because 8=8.
Making a ten is an arithmetic evaluation strategy where students first find a way to obtain 10 from an expression before proceeding to the remainder.
Given the expression :
12 - 4
Make a ten from 12 :
12 = 10 + 2 (10 remainder 2)
Using subtracting 4 from 10 :
10 - 4 = 6
Adding the remainder (2) to the value obtained :.
6 + 2 = 8
Therefore, the direct procedure also gives the same solution ; 12 - 4 = 8.
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