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7: If you double the last digit and subtract it from the rest of the number and the answer is: 0 or Divisible by 7 (Note: you can apply this rule to that answer again if you want)

Example: 1, 672 (Double 2 is 4, 67-4=63, and 63÷7=9) Yes2, 905 (Double 5 is 10, 90-10=80, and 80÷7=11 3/7) No

8: The last three digits are divisible by 8

Example: 1,109816 (816÷8=102) Yes 2,216302 (302÷8=37 3/4) No

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Q: What is the divisibility of 7 and 8?
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