6th Factors and Multiples - ICSE Board

Class-VI

Factors and Multiples

(Including H.C.F and L.C.M)

ICSE Board

 1.         Write all the factors of:

a)         15        b) 55                c)         48        d) 36                e)84

2.         Write all prime numbers:

a)         less than 25     b)         between 15 and 35      c)  between 8 and 76.

3.         Write  the prime factors of:

a)         5 to 45 b)         2 to 32 c) 8 to 48         d) 9 to 59

 4.         Write prime factors of:

a)         16        b)         27        c)         35        d)         49

5.         If P_n ,means prime factors of n find:

a)         P₆           b)P₂₄         c)P₅₀                d) P₄₂
 

6.         Using common factor method, find the H.C.F. of:

a)         16 and 35        b)         25 and 20        c)27 and 75    d)8,12 and 18  

7.         Find the H.C.F of the following numbers using prime factor method:

a)         5 and 8            b)24 and49                  c)40,60 and 80            d)12,16 and 28

8.         Find the H.C.F of the following numbers using division method:

a)         16 and 24        b)7,14 and 24  c)70,80,120 and 150

9.         Use method of your choice to find the H.C.F of:

a)         45,75 and 135           b)66,33 and 132          c)30,60,90 and 105

 10.       The H.C.F and the L.C.M  of two numbers are 50 and 300 respectively.If one of the numbers is 150, find the other number.

11.       The product of two numbers is 432 and their L.C.M is 72.Find their H.C.F.

 12.       The product of  two numbers is 19,200 and their H.C.F is 40.Find their  L.C.M.

13.       Find the least number which when divided by 12,15,18,24 and 36 leaves no remainder.

14.       Find the least number which when increased by one is exactly divisible by 12,18,24,32 and 40.

15.       Find the least number which on decreasing by 3, is completely divisible by 18,36,32 and 27.