Question

What is the first step when adding the fractions 2/5+7/10

Answer 1

firs find the least common multiple (LCM) of the denominators

Explanation:

2/5+7/10

Multiples of 5 = {5,10,15,20,25,30,35...}

Multiples of 10 = {10,20,30,40,50...}

Common multiples = {10,20,30,...}

Least Common Multiples = {10}

2/5+7/10

= 2(2) + 7(1)

= 11/LCM

But the LCM = 10

11/10

Answer 2

get the denominators to match