CL- 5 - MATH- FACTORS AND MULTIPLES- Revision worksheet- 2


1.       If one number divides exactly into another with no remainder, we say the second number is a multiple of the first number
Eg.  6 divides exactly into 12, therefore 12 is a multiple of 6.
       5 divides exactly into 45, therefore 45 is a multiple of 5.

 2.      Which of these statements are true and which are false? (put a tick mark for true and cross for false)
a) 16 is a multiple of 4                             b) 42 is a multiple of 7
c) 15 is a multiple of 2                             d) 100 is a multiple of 3
e) 40 is a multiple of 4 and 10               f) 27 is a multiple of 3 and 9

2. Write three multiples of 7 smaller than 50.   ______________________________

3.  Circle the multiples of 6.    -   23,    50,        48,        24,        67,        30,                   42

4.  Circle the factors of 45.      -   9,      90,        180,      7,           1,           15,                   3,       5

5.  Write a multiple of 37 between 100 and 120.        _____________

6. Write the missing multiples
a)  7           ____   21      ____     ____     ____     ____     ____     ____
b)  4          ____   ____   ____     20          ____     ____     ____     ____
c)  99        88       ____   ____     ____     ____     ____     ____     11
d) 81         72     ____     ____     ____     ____     ____     ____     ____
    
7.  Find factors by completing these factor trees
a)               50                                                                                           

       5                   ______               
                                        
                   ______          ______

_____  X  ______ X _____ = 50

b)                  18

       2                   ______               
                                        
                   ______          ______

_____  X  ______ X _____ = 18

8.  Write the least prime number which is greater than 24.   _______

9.  Write the prime factorisation of the following numbers.
a) 356
b)120

10.  Find the H.C.F. of the following numbers by division method
a) 198 and 360                                           b) 40 and 76


11. Find L.C.M. by prime factorization
a) 12, 18, 25                                                                             b) 16, 48

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