Which of the following numbers is divisible by 9
Answers
Answer:
A number is divisible by 9, if the sum is a multiple of 9 or if the sum of its digits is divisible by 9. Consider the following numbers which are divisible by 9, using the test of divisibility by 9: 99, 198, 171, 9990, 3411. Sum of the digits of 99 = 9 + 9 = 18, which is divisible by 9.
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Given : Numbers
347
346
215
153
To Find : Which of the numbers above is divisible by 9
Solution:
A number is divisible by 9 if sum of its digits is divisible by 9
347
sum of digits = 3 + 4 + 7 = 14 not divisible by 9
346
sum of digits = 3 + 4 + 6 = 13 not divisible by 9
215
sum of digits = 2 + 1 + 5 = 8 not divisible by 9
153
sum of digits = 1 + 5 + 2 = 9 is divisible by 9
Hence 153 is divisible by 9
153 = 17 * 9
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