Question

How does 10 - 4 help you solve 30 - 4

Answer 1

It helps because if you know 10-4=6 then you know that 30-4 would be 26. Since 30 is only 20 more than 10 you know that 20+6 would be the answer.

Answer 2

The value of given expression is 26.

Explanation:

We need to solve 30 - 4 using 10 - 4.

First of all solve 10 - 4.

`10-4=6` .... (1)

Consider the given expression

30 - 4

Split the number 30 as the sum 10 and a number.

(20 + 10) - 4

It can be written as

(20 + 10) + (-4)

Using associative property of addition.

20 + (10 + (-4))

20 + (10 - 4)

Using equation (1) we get

20 + 6

26

Therefore the value of given expression is 26.