Divisibility Rule of 9
Divisibility Rule of 9
Divisibility Rule of 9:
A number is divisible by 9, if the sum of its digits is divisible by 9.
Justification:
Let us first consider case of a two digit number:
be a two digit number. Then, n can be written as
n = 10a + b, where b is units digit of n.
n = 9a + a + b
n = a multiple of 9 + ( a + b )
n is a multiple of 9, if ( a + b ) is a multiple of 9
Thus, a two digit number is divisible by 9, if the sum of its digits is divisible by 9.
Which number is divisible by 6 and 9? | |||
| Right Option : D | |||
| View Explanation |
Which of the following number is divisible by 9 ? 642,999,888,772 | |||
| Right Option : A | |||
| View Explanation | |||
Replace by a digit so that the number is divisible by 9. 1______ 80498 | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [10]
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
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Om Umang
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8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
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8thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
