- A100
- B105
- C110
- D995
Step-by-Step Solution
The smallest 3-digit number is 100. 100 ÷ 5 = 20 exactly. So 100 is divisible by 5.
Answer: A) 100
What is the smallest 3-digit number divisible by 5?
Class 6Playing with NumbersPlaying with Numbers
Key idea: Quick divisibility tests
Some checks are so fast you can do them in your head:
- **By 2**: the last digit is even (0, 2, 4, 6, or 8).
- **By 3**: the sum of the digits is divisible by 3. (273 → 2 + 7 + 3 = 12 → 12 ÷ 3 = 4 ✓)
- **By 5**: the last digit is 0 or 5.
- **By 9**: the sum of the digits is divisible by 9.
- **By 10**: the last digit is 0.
- **By 4**: the last two digits form a number divisible by 4.
These let you spot factors without doing the full division.
- **By 2**: the last digit is even (0, 2, 4, 6, or 8).
- **By 3**: the sum of the digits is divisible by 3. (273 → 2 + 7 + 3 = 12 → 12 ÷ 3 = 4 ✓)
- **By 5**: the last digit is 0 or 5.
- **By 9**: the sum of the digits is divisible by 9.
- **By 10**: the last digit is 0.
- **By 4**: the last two digits form a number divisible by 4.
These let you spot factors without doing the full division.
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