What is the smallest positive number that must be added to 478 to make it divisible by 9?
- A.8 ✓
- B.7
- C.10
- D.9
Explanation: 478 ÷ 9 leaves a remainder, and adding 8 reaches the next multiple of 9.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
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