Multiple choice

What is the sum of the greatest three-digit number and the smallest four-digit number, whose HCF is 23?

  1. 2001

  2. 2002

  3. 1984

  4. 1998

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

The greatest 3-digit multiple of 23 is 23 × 43 = 989 (since 999 ÷ 23 = 43 remainder 10). The smallest 4-digit multiple of 23 is 23 × 44 = 1012 (since 1000 ÷ 23 = 43 remainder 11). Sum = 989 + 1012 = 2001.