Add 1/3 and 1/4.

• A. 1/2
• B. 7/12
• C. 5/12
• D. 2/3

Answer: (B)

When adding fractions, you must use a common denominator. For 1/3 and 1/4, the smallest common denominator is 12. Convert each fraction: 1/3 becomes 4/12 (since 12 ÷ 3 = 4) and 1/4 becomes 3/12 (since 12 ÷ 4 = 3). Add the numerators over the common denominator: 4/12 + 3/12 = 7/12. So the sum is 7/12. A quick check: 1/3 ≈ 0.333 and 1/4 = 0.25, total ≈ 0.5833, and 7/12 ≈ 0.5833, which matches. The other possible results would come from using different sums that don’t reflect the proper conversion to a common denominator, like 1/2 (6/12) or 2/3 (8/12).