What is 3/4 + 1/3?

To add fractions with different denominators, find the common denominator. Least common multiple of 4 and 3 is 12. Convert: 3/4 = 9/12 (multiply by 3/3), 1/3 = 4/12 (multiply by 4/4). Add: 9/12 + 4/12 = 13/12. The answer is 13/12 or 1 1/12 as a mixed number. Common mistakes: adding numerators and denominators directly (3+1)/(4+3) = 4/7 — wrong. Adding without common denominator is invalid. Quick check: 3/4 is 0.75 and 1/3 is about 0.33, so the sum should be about 1.08. 13/12 ≈ 1.083 ✓. The ASVAB tests fundamentals of fractions: adding, subtracting, multiplying, dividing. Remember: multiply fractions straight across (numerator × numerator, denominator × denominator), divide by multiplying by the reciprocal.