(Set 1)
01. Write the prime numbers between 1 to 100.
02. Write the divisibility by the following numbers.
2, 3, 4, 5, 6, 7, 8, 9, 10, 11
03. Find the LCM of the following.
a. 8, 12, 20
b. 15, 30, 60, 120
c. 5, 12, 15, 20
d. 4, 12, 18, 20
04. Find the HCF of the following.
a. 10, 14, 18
b. 12, 18, 24
c. 18, 36, 72
05. Find the LCM of 12 and 20, if their HCF is 4.
06. Find the HCF of 18 and 20, if their LCM is 180.
07. Find the LCM and HCF of 12 and 15. Is the product of the LCM and HCF equal to
08. Use the divisibility rule to find if
a. 6,75,432 is divisible by 12 and 18.
b. 1,98,465 is divisible by 15.
09. Make the factor tree of 28.
10. Write the multiples of 3 between 10 and 25.
11. Write two prime numbers whose sum is 13.
12. Write two composite numbers that are divisible by 4.
13. Find the LCM of 6, 15 and 20.
14. Find the HCF of 20, 25 and 40.
15. Find the LCM of 12 and 21 if their HCF is 3.
16. Find the HCF of 21 and 28 if their LCM is 84.
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