Question

Tanaysha was trying to solve 72-8. She said that she could do 72+2=74 and 74-10 to solve. What strategy did she use?

Answer 1

Tanaysha replace 8 by ( 10 -2) to solve the given expression.

Explanation:

Here, the given expression to be solved is:

72 - 8 .......... (1)

Now, as we know: 8 = 10 - 2

Replacing the value of 8 with ( 10 - 2), we get:

72 - 8

= 72 - (10 - 2)

= 72 - 10 + 2

= (72 + 2 ) - 10

Now, adding ( 72 ) and ( 2) , we get:

= 74 - 10

Subtracting 10 from 74, we get:

= 64

So, Tanaysha replace 8 by ( 10 -2) to solve the given expression.