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Problem
Adding fractions requires finding least common denominator which is time-consuming.
Solution
Use cross-multiplication: (a/b + c/d) = (ad + bc) / (bd)
Benefit
Universal method that works for any fraction addition without finding LCD.
Example
2/3 + 3/4:
(2×4 + 3×3) / (3×4)
(8 + 9) / 12
17/12 = 1 5/12
1/5 + 2/7:
(1×7 + 2×5) / (5×7)
(7 + 10) / 35
17/35