1. Write the following number in digits: Two hundred fifty-six thousand, eight hundred twenty-one.

2. Write the number 407,036 in words.

3. Check whether the number 543 is divisible by 3. Show your working

4. Is the number 1,248 divisible by 4 and 6? Justify your answer.

5. Determine if 18,927 is divisible by 9. Explain your reasoning.

6. Find the H.C.F. of 18 and 30 using the prime factorization method.

7. Determine the H.C.F. of 48 and 72 using the division method.

8. List the common factors of 24 and 36 and find their G.C.F.

9. Write a 5-digit number that is divisible by both 3 and 9. Explain your choice.

10. Find the smallest number divisible by 4, 6, and 9.