1. Check whether 3718 is divisible by 13 or not?Solution:Divisibility rule of 13 :
4 times the last digit and add it to the rest of the number.
If the answer is divisible by 13, then number is also divisible by 13.
(Apply this rule to the answer again if necessary)
`371color{red}{8}=>371 + color{red}{8} xx 4 = 371 +32 = 403`
`40color{red}{3}=>40 + color{red}{3} xx 4 = 40 +12 = 52`
Here 52 is divisible by 13.
`:.` 3718 is divisible by 13.
2. Check whether 3965 is divisible by 13 or not?Solution:Divisibility rule of 13 :
4 times the last digit and add it to the rest of the number.
If the answer is divisible by 13, then number is also divisible by 13.
(Apply this rule to the answer again if necessary)
`396color{red}{5}=>396 + color{red}{5} xx 4 = 396 +20 = 416`
`41color{red}{6}=>41 + color{red}{6} xx 4 = 41 +24 = 65`
Here 65 is divisible by 13.
`:.` 3965 is divisible by 13.
3. Check whether 5031 is divisible by 13 or not?Solution:Divisibility rule of 13 :
4 times the last digit and add it to the rest of the number.
If the answer is divisible by 13, then number is also divisible by 13.
(Apply this rule to the answer again if necessary)
`503color{red}{1}=>503 + color{red}{1} xx 4 = 503 +4 = 507`
`50color{red}{7}=>50 + color{red}{7} xx 4 = 50 +28 = 78`
Here 78 is divisible by 13.
`:.` 5031 is divisible by 13.
4. Check whether 3377 is divisible by 13 or not?Solution:Divisibility rule of 13 :
4 times the last digit and add it to the rest of the number.
If the answer is divisible by 13, then number is also divisible by 13.
(Apply this rule to the answer again if necessary)
`337color{red}{7}=>337 + color{red}{7} xx 4 = 337 +28 = 365`
`36color{red}{5}=>36 + color{red}{5} xx 4 = 36 +20 = 56`
Here 56 is not divisible by 13.
`:.` 3377 is not divisible by 13.
5. Check whether 4109 is divisible by 13 or not?Solution:Divisibility rule of 13 :
4 times the last digit and add it to the rest of the number.
If the answer is divisible by 13, then number is also divisible by 13.
(Apply this rule to the answer again if necessary)
`410color{red}{9}=>410 + color{red}{9} xx 4 = 410 +36 = 446`
`44color{red}{6}=>44 + color{red}{6} xx 4 = 44 +24 = 68`
Here 68 is not divisible by 13.
`:.` 4109 is not divisible by 13.
6. Check whether 4915 is divisible by 13 or not?Solution:Divisibility rule of 13 :
4 times the last digit and add it to the rest of the number.
If the answer is divisible by 13, then number is also divisible by 13.
(Apply this rule to the answer again if necessary)
`491color{red}{5}=>491 + color{red}{5} xx 4 = 491 +20 = 511`
`51color{red}{1}=>51 + color{red}{1} xx 4 = 51 +4 = 55`
Here 55 is not divisible by 13.
`:.` 4915 is not divisible by 13.
This material is intended as a summary. Use your textbook for detail explanation.
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