Prime Time Class 6 Very Short Question Answer

Prime Time Class 6 Very Short Question Answer

Prime Time Class 6 Very Short Question Answer

Question 1.

Check whether the two numbers 63 and 105 are co-prime or not.

Solution:

63 = 7 × 9 and 105 = 7 × 15. So, these two numbers are not co-prime.

Question 2.

Using divisibility rule, check whether the number 27844 is divisible by 8 or not.

Solution:

Number formed by last three digits is 844, which is not divisible by 8. So, 27844 is not divisible by 8.

Question 3.

Write the prime factorisation of 231.

Solution:

231 = 3 × 7 × 11.

Question 4.

Find the first common multiple of 15 and 18.

Solution:

Multiple of 15 = 15,30,45,75,90,105,...

Multiple of 18 = 18, 36, 54, 72, 90, 108, ...

So, required first common multiple is 90.

Question 5.

Find the number of leap year from the year 2010 to 2024.

Solution:

Leap years are 2012, 2016, 2020 and 2024. So, total 4 leap years.