An example for #1 would be that: 15 is divisible by 3, but not 9. every third multiple of 3, (9, 18, 27,...) is divisible by 9 because 9 is three times the size of 3.
For part two the first number that I thought of is 23.
Answer:
406 pieces. If you multiply 58 times 7 you get 406. 406 divided by 58 is 7.
see picture for steps
x= 10
Step-by-step explanation: