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### Divisible by 7 (Math Trick)...

A number is divisible by 7 if, subtract 2 times the last digit from the remaining number and its result is divisible by 7. Let us we will apply this interesting math rule on following examples.

• Is 203 divisible by 7?
• Here the last number is 3 and remaining is 20. Apply the above rule. i.e. Double the last digit (3) and subtract it from remaining number (20) Now the result 14 is divisible by 7 so 203 is divisible by 7.
(Do this step in your mind)

• Is 3164 divisible by 7?
• Here 308 is big number (If you feel difficult to divide you can apply the rule again). Now the result 14 is divisible by 7 so the number 3164 is also divisible by 7.
(Do this step in your mind)

• Is 108346 divisible by 7?
• Now the result 91 is divisible by 7, so the number 108346 is also divisible by 7.
(Do this step in your mind)

##### SHORTCUT TRICKS (Division)
• Divisible by 2 Shortcut trick
• Divisible by 3 Shortcut trick
• Divisible by 4 Shortcut trick
• Divisible by 5 Shortcut trick
• Divisible by 6 Shortcut trick • Divisible by 7 Shortcut trick • Divisible by 8 Shortcut trick • Divisible by 9 Shortcut trick
• Divisible by 10 Shortcut trick

##### Worksheets (Solved)

###### Integration     