Question

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

Answer 1

Because it is just backwards 1+7=8 and 7+1=8 so that why

Answer 2

Answer:

Using communicative property.

Step-by-step explanation:

We are given to find the sum for 7+1 using 1+7.

Here we will use communicative property of addition.

Property says:  a + b = b + a

Result of a+b would be equivalent to b+a.

Now we apply this property into our question.

Using communicative property we can write 1+7 is equivalent to 7+1

So, If we know the result of 1+7 then find the sum 7+1.

Therefore, sum of 1 +7 = 8  = 7+1

Thus, Using communicative property.