12. What is the least common multiple of 54 and 72?

12. What is the least common multiple of 54 and 72?

12=2×2×3
54=2×3×3×3
72=2×2×2×3×3
So the least common multiple of 12, 54 and 72 is 2 × 2 × 2 × 3 × 3 = 216

The least common multiple of 18, 45 and 54

270

What is the greatest common divisor and the least common multiple of 45 and 54

The greatest common divisor of 45 and 54 is 9, and the least common multiple is 270

Angle a = 36 degrees and 45 minutes, find the complement and remainder of angle A

Complementary angle = 180 degrees - 36 degrees 45 minutes 143 degrees 15 minutes
Residual angle = 90 degrees - 36 degrees 45 minutes = 53 degrees 15 minutes