Divisibility
Practise rules for 2, 3, 4, 5, 6, 8, 9, and 10, plus divisors, multiples, and digit sums.
How to solve this
- For 2, 5, and 10, the last digit is enough: 245 is divisible by 5 because it ends in 5.
- For 3 and 9, add the digits: 738 has digit sum 18, so it is divisible by both 3 and 9.
- A divisor divides exactly; a multiple is the result of multiplying. Since 24 = 6 × 4, 6 is a divisor and 24 is a multiple of 6.
Examples
Is 245 divisible by 5?
yes
Digit sum of 738
18
Divisors of 24
1, 2, 3, 4, 6, 8, 12, 24