Question

What is the sum of 7/2 + -3/5

Answer 1

there is no 2.9

Answer 2

29/10?

Answer 3

ya thats there

Answer 4

thank you

Answer 5

2.9 = 29/10. One is just written as a decimal.

Do you understand how to arrive at 29/10?

Answer 6

nope

Answer 7

Consider the denominators in your original problem. How could we arrive at a common denominator?

Answer 8

what do u mean

Answer 9

When we have fractions with different denominators, we cannot add or subtract straightforwardly. We first have to convert each to a common denominator.

For example, if we had 1/3 + 1/4 we would convert both fractions such that each had a denominator of 12

1/3 = 4/12
1/4 = 3/12

1/3 + 1/4 = 4/12 + 3/12 = 7/12

Another way of asking the question is: what is a common multiple of 3 and 4? In this case, 12 is. So we convert each fraction so it has a denominator of 12, then add them.

The same reasoning is true for your problem. What is a common multiple of 2 and 5?

Answer 10

o ok thank u i get it now

Answer 11

Ok! Best of luck with your studies.