Question

Explain how does knowing 1 + 7 helps you find the sum for 7 +1

Answer 1

Well 1+7 =8
And 7+1 are the same digits so 1+7=7+1=8

Answer 2

Explanation: For this, we take two different numbers.

Let the first number be
`x` and the second number be
`y`

We use the commutative property, which says that the sum will remain same in whatever way the numbers are written.

Mathematically,

`x+y=y+x`

From the question,

x = 1

y = 7

Putting this in the commutative property equation, we get:

`1+7=7+1`

Hence, the sum of both the umber will be same.