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Presentation On Quick Divisibility Test

Published in: CAT Exam | IBPS | Mathematics
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  • Dipu T

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The PPT illustrates how quickly and effectively you can check whether any number, no matter how large it is, is divisible by any given number. This method will help the students in simplification while dealing with complex calculations.

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    TEST OF DIVISIBILITY All you need to know about numbers being divisible by 2, 3, , e, 13. Prepared by : DIPU SIR
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    A number a is exactly divisible by another number p when it does not leave any remainder, Where q is the quotient with which we multiply p to get a.
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    DHVUSUBHLUTY BY 2 A number is divisible by 2 if: It is an even number, i.e., it ends in 0, 2, 4, 6 or 8. Example: 26 is divisible by 2 as it ends in 6 but 25 is not divisible by 2 as it ends in 5, an odd number,
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    DHVUSUBHLUTY BY 3 A number is divisible by 3 if: The sum of the digits of the number is divisible by 3, i.e., the sum is a multiple of 3, Example: 27 is divisible by 3 as 2 + 7= 9 is divisible by 3 but 28 is not divisible by 3 as 2 10 is not divisible by 3.
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    4 A number is divisible by 4 if: The last two digits of the number is divisible by 4, i.e., it is a multiple of 4, Example: 516 is divisible by 4 as 16 is divisible by 4 but 518 is not divisible by 4 as 18 is not divisible by 4.
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    DHVUSUBHLUTY BY 5 A number is divisible by 5 if: It ends in 0 or 5, Example: 25 is divisible by 5 as it ends in 5 but 52 is not divisible by 5 as it does not end
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    A number is divisible by 6 if: It is an even number and is divisible by 3, i.e., it is divisible by both 2 and 3, Example: 84 is divisible by 6 as it is divisible by both 2 and 3 but 94 is not divisible by 6 as it is divisible by 2 but not by 3.
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    DUVHSH3BLHTY BY To check divisibility by 7: We divide the number into groups of 3 digits (starting from right) and find the difference between the sum of the numbers (not digits) in odd and even places. If the difference is 0 or a number divisible by 7, the original number is also divisible by 7, Example: 1094968: (968 + l) - 094 = 875 which is divisible by 7 but 1094969 is not divisible by 7 as (969 + 1) - 094 = 876 is not divisible by 7,
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    DHVUSUBHLUTY BY e A number is divisible by 8 if: The last three digits of the number is divisible by 8, i.e., it is a multiple of 8. Example: 1800 is divisible by 8 as 800 is divisible by 8 but 1900 is not divisible by 8 as 900 is not divisible by 8,
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    DHVUSUBHLUTY BY 9 A number is divisible by 9 if: The sum of the digits of the number is divisible by 9, i.e., the sum is a multiple of 9, Example: 27 is divisible by 9 as 2 + 7= 9 is divisible by 9 but 39 is not divisible by 9 as 3 +9 = 12 is not divisible by 9.
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    A number is divisible by 10 if: It ends in 0, Example: 250 is divisible by 10 as it ends in 0 but 255 is not divisible by 10 as it does not end in 0,
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    A number is divisible by 11 if: The difference between the sum of the digits at odd places and the sum of the digits at even places is either 0 or a number divisible Example: 1353 is divisible by 11 as (1 + 5) + 3) = 6-6 = 0 but 1253 is not divisible by 11 as (1 + 5) - (2 + 3)= 6- 5= 1 is not divisible by
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    A number is divisible by 12 if: It is divisible by 3 and the last two digits of the number is divisible by 4, i.e., it is divisible by both 3 and 4, Example: 384 is divisible by 12 as it is divisible by both 3 and 4 but 184 is not divisible by 12 as it is divisible by 4 but not by 3.
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    To check divisibility by 13: We divide the number into groups of 3 digits (starting from right) and find the difference between the sum of the numbers (not digits) in odd and even places. If the difference is 0 or a number divisible by 13, the original number is also divisible by 13, Example: 91 which is 579488: 579 488 divisible by 13 but 579489 is not divisible by 13 as 579 - 489 = 90 is not divisible by 13.
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    REVHEW Check whether the following divisible by 2, 3, 4, 5, 6, 7, 8, and13: 314 9873 17654350 24567888 23675785 895554352 5633894417 numbers are 9, 10, Il, 12

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