Shortcut division rules for 11 to 100 - Division rules lesson 3.

Hey friends, once again we come back to finish the division rules. We have finished 1 to 5 division rules with the example in the 1st tutorial and the 2nd one was division rules for 6 to 10. Today, we will give you few more formula which helps to find out whether a number is divisible by which numbers between 11 to 100. In this way, we will finish our division rules of 1 to 100 with a concluding post. Without any wastage of time, we are looking forward to our shortcut formulae.

Division rules for 11 to 30

Division rules of 11 (eleven): - When you have to know a number whether it divisible by 11 or not, then just add all the even places digits and odd places digits first. After then subtract the added value between even and odd places. If you got the result as zero or the subtracted value is exactly divisible by 11, then the number obviously divisible by 11. Look at below, how to perform to find out a number whether it divisible by 11 or not? And get a clear idea. 

Division rules of 12 (twelve): - To evaluate whether a number divisible by 12 or not!  The shortcut formula is very tricky like as division rules of 6. As you had known that the factors of 12 are 3 and 4. So, all the number will divide by 12 which also divisible by 3 and 4 both.
Division rules of 15: - You learned divisible rules of 12, then you can guess what I will say about the division rules of 15. Yes, friends, you are correctly observing that the factor of 15 is 3 and 5. Because of 15= 3*5. So, all the number will divisible 15 which also divisible by 3 and 5.
Division rules of 20 (twenty): - This is an effortless formula, you can easily find out a number whether it divisible by 20 or not. Just you have to see last two digits where the unit place of one is zero and unit place of tens is an odd number or zero.
Division rules of 25 (twenty-five):- In this formula, you have to also see last two digits. Last two digits will be 00, 25,50 or 75.
Division rules of 30: - I think you do not need more division rules because now you are able to create the shortcut rule. And you are thinking that division rules are very easy. And also thinking that all the numbers will divisible by 30 which is also divided by both number 3 and 10. 
Yes friend, are you thinking are we closing the division rules here? The answer is no. Now are asking you which numbers will divisible will divisible by 17, 37? This is not as usual shortcut formula like we used in previous formulas. It is something different because these numbers are prime. So the factor is 1 and itself. So which division rules have will apply here? Yes, friend, we have some numbers tricks which help you so.

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