Ncert solutions

Ncert solutions

Grade 6

Playing With Numbers | Exercise 3.5

Question 9

Q10) Determine if 25110 is divisible by 45.

SOLUTION:

we have 45=5\times9 also 5 and 9 are co-prime.

now, 25110 is divisible by 5 because its units digit is 0.

again sum of digit =2+5+1+1+0=9

since the sum of digits is divisible by 9, so 25110 is also divisible by 9.

also, since the number is divisible by both 5 and 9, where 5 and 9 are co-prime.

25110 is divisible by their product also i.e 5\times9=45

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subject-cta

Question 9

Q10) Determine if 25110 is divisible by 45.

SOLUTION:

we have 45=5\times9 also 5 and 9 are co-prime.

now, 25110 is divisible by 5 because its units digit is 0.

again sum of digit =2+5+1+1+0=9

since the sum of digits is divisible by 9, so 25110 is also divisible by 9.

also, since the number is divisible by both 5 and 9, where 5 and 9 are co-prime.

25110 is divisible by their product also i.e 5\times9=45

Still have questions? Our expert teachers can help you out

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subject-cta
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