Page 61 - Start Up Mathematics_5

4. Find the LCM of the following numbers by prime factorization.

(a) 220 and 320 (b) 440 and 520 (c) 350, 400 and 550

5. Write True or False.
(a) 1 is the least factor of any number. ____________
(b) Prime numbers have only one factor which is 1. ____________

(c) 0 is the smallest composite number. ____________
(d) The HCF of co-prime numbers is always 1. ____________

SOME NCERT TEXTBOOK QUESTIONS

1. Complete the table for different numbers of bangles. For each number see what
different groups can be made, without any bangle being left.

Number of Different groups we can make
bangles

18 1, 2, 3, 6, 9, 18

24

5

9

7

2

10

1

20

13

21

53