Page 72 - Start Up Mathematics_6

5. Find whether the product of three consecutive numbers is divisible by 6. Give reasons.

6. Complete the following table and find the relationship between HCF and LCM.

Numbers HCF LCM HCF × LCM Product of numbers

12, 18 .............. 36 .............. 216

15, 20 5 .............. .............. 300

........, 124 .............. .............. 12,152 ..............

Values and Life Skills

Three persons step off together for a morning walk. Their steps measure 80 cm, 85 cm and
90 cm respectively. What is the minimum distance each person should walk so that all of
them can cover that same distance in complete steps? Is morning walk good for health? Do
you go for a morning walk?

Some NCERT Textbook Questions

1. Match the items in Column 1 with the items in Column 2.

Column 1 Column 2

(i) 35 (a) Multiple of 8
(ii) 15 (b) Multiple of 7
(iii) 16 (c) Multiple of 70

(iv) 20 (d) Factor of 30
(v) 25 (e) Factor of 50

(f) Factor of 20

2. Find all the multiples of 9 upto 100.
3. The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3.
Find such pairs of prime numbers upto 100.

4. Write down separately the prime and composite numbers less than 20.

5. Express the following as the sum of two odd primes.
(a) 44 (b) 36 (c) 24 (d) 18

6. Write the smallest digit and the greatest digit in the blank space of each of the following
numbers so that the number formed is divisible by 3:
(a) ___ 6724 (b) 4765 ___ 2

7. Write a digit in the blank space of each of the following numbers so that the number formed
is divisible by 11.
(a) 92 ___ 389 (b) 8 ___ 9484

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