Worked examples
Two examples
Example 1
Is 3,426 divisible by 3?
- Add the digits: 3 + 4 + 2 + 6 = 15.
- 15 is divisible by 3, so 3,426 is too.
Answer: Yes
Example 2
Is 7,415 divisible by 10?
- A number is divisible by 10 when its last digit is 0.
- The last digit is 5.
Answer: No
Where this is taught: Quiz 7: Factors, Multiples, and Primes, “The divisibility tests”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.