A number is divisible by both 12 and 15. What is the smallest number that is als

Practice Questions

Q1
A number is divisible by both 12 and 15. What is the smallest number that is also divisible by both? (2023)
  1. 30
  2. 60
  3. 90
  4. 120

Questions & Step-by-Step Solutions

A number is divisible by both 12 and 15. What is the smallest number that is also divisible by both? (2023)
  • Step 1: Understand that we need to find a number that can be divided evenly by both 12 and 15.
  • Step 2: Find the prime factorization of 12. It is 2 x 2 x 3 (or 2^2 x 3).
  • Step 3: Find the prime factorization of 15. It is 3 x 5.
  • Step 4: To find the LCM (Least Common Multiple), take the highest power of each prime number from both factorizations.
  • Step 5: From 12, we have 2^2 and 3. From 15, we have 3 and 5.
  • Step 6: The highest power of 2 is 2^2, the highest power of 3 is 3, and the highest power of 5 is 5.
  • Step 7: Multiply these together: 2^2 (which is 4) x 3 x 5.
  • Step 8: Calculate 4 x 3 = 12.
  • Step 9: Now calculate 12 x 5 = 60.
  • Step 10: Therefore, the smallest number that is divisible by both 12 and 15 is 60.
  • Least Common Multiple (LCM) – The smallest positive integer that is divisible by two or more numbers.
  • Divisibility Rules – Understanding how to determine if a number is divisible by another number.
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