Multiple choice general knowledge math & puzzles

What is the smallest number that is exactly divisible by 1,2,3,4,5,6,7,8,9,10 ?

  1. 1260

  2. 420

  3. 840

  4. 2520

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The smallest number divisible by 1 through 10 is the LCM of these numbers. Prime factorization: 1, 2, 3, 4=2², 5, 6=2×3, 7, 8=2³, 9=3², 10=2×5. The LCM takes the highest power of each prime: 2³ × 3² × 5 × 7 = 8 × 9 × 5 × 7 = 2520. Options A, B, and C are all missing factors.