Tests for Three and Nine Worksheet with Answer Key

What's on the worksheet

1. Find each number's digit sum, then its remainders when divided by 9 and by 3.
   4,82763,0187,05195,417300,003
2. Word problem: use the digit sum to find how many of Mateo's stamps are on the last page.
3. Jenny's number has digit sum 30: decide divisibility by 3 and 9 and find the remainder.
4. Find the largest five-digit number divisible by 9 with five different digits, and explain why.
5. Show that Omar's remainder when dividing 7,426 by 9 is wrong, then correct it.
6. Find the digit Mia must add to 2,571 to make a five-digit multiple of 9.