Question

Greg has

3 rows of stamps with 10 stamps in
each row. Greg says there are a total of
35 stamps. Use what you have learned
about multiples of 10 to explain why
Greg is incorrect.

Answer 1

It could not end in 5 and only in 0

Answer 2

All multiples of 10 end with 0 only. So 35 must be wrong as it ends with 5. Therefore, Greg is incorrect.