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To find if a number is divisible by 2
Check to see if the number is even.
It must end in a 0, 2, 4, 6, or 8. You try! Is 33 divisible by 2? yes no Rule for 2 94 is even since ends in a 4 Is 94 divisible by 2? Yes 94 is divisble by 2!
To find if a number is divisible by 3
Check to see if the sum of the digits is divisible by 3. You try! Is 33 divisible by 3? yes no Rule for 3 Since 9+4=13 and 13 is not evenly divisible by 3, 94 is not evenly divisible by 3 Is 94 divisible by 3? To find if a number is divisible by 4
Check to see if the last 2 digits are divisible by 4. You try! Is 142 divisible by 4? yes no Rule for 4 The last two digits are 20.
Since 20 is divisible by 4 120 is divisible by 4. Is 120 divisible by 4? To find if a number is divisible by 5
Check to see if the last digit is a 0 or 5. You try! Is 241 divisible by 5? yes no Rule for 5 Since the last digit is a 0, 120 is divisible by 5. Is 120 divisible by 5? To find if a number is divisible by 6
Check to see if it is divisible by both 2 and 3. You try! Is 246 divisible by 6? yes no Rule for 6 Since 126 is even it is divisible by 2.
Since 1+2+6=9 and 9 is divisible by 3, 126 is divisible by 3.
Since 126 is divisible by both 2 and 3 it is also divisible by 6. Is 126 divisible by 6? To find if a number is divisible by 8
Check to see if the last 3 digits are divisible by 8. You try! Is 808 divisible by 8? yes no Rule for 8 The last 3 digits are 888.
Since 888 is divisible by 8, 2,888 is divisible by 8. Is 2,888 divisible by 8? To find if a number is divisible by 9
Check to see if the sum of the digits is divisible by 9. You try! Is 234 divisible by 9? yes no Rule for 9 Since 1+4+4=9 and 9 is divisible by 3, 144 is evenly divisible by 9. Is 144 divisible by 9? To find if a number is divisible by 10
Check to see if the last digit is a 0. You try! Is 2401 divisible by 10? yes Rule for 10
no Since the last digit is a 0, 120 is divisible by 10. Is 120 divisible by 10? |