Compute 2/5 + 3/10.

Compute 2/5 + 3/10.

• A. 1/3
• B. 1/2
• C. 7/10
• D. 1 1/5

Answer: (C)

When adding fractions with different denominators, first convert to a common denominator. Here, rewrite 2/5 as 4/10. Then add the fractions: 4/10 + 3/10 = 7/10. This is the same as 0.7. The other options don’t match this value: 1/3 ≈ 0.333, 1/2 = 0.5, and 1 1/5 = 1.2.

When adding fractions with different denominators, first convert to a common denominator. Here, rewrite 2/5 as 4/10. Then add the fractions: 4/10 + 3/10 = 7/10. This is the same as 0.7. The other options don’t match this value: 1/3 ≈ 0.333, 1/2 = 0.5, and 1 1/5 = 1.2.