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6. In Diwali, Sonal lits the colourful light at the entrance gate. A blue light flashes every 8 seconds
while the red light flashes every 12 seconds. Both lights have just flashed together. After how many
seconds will both lights flash together?
7. Breads are sold in pack of 20. Eggs are sold in a tray of 12. Namita buys exactly the same number
of breads and eggs. What is the least number of each pack she should buy?

8. Fill in the blanks.
(a) Smallest odd number is .................... .

(b) First 3 multiples of 12 are .................... .
(c) 12, 15, 21, 27 are the multiple of .................... .

(d) .................... is a factor of every even number.
(e) A number is a factor of another number if on dividing the .................... is zero.
9. Complete the given multiplication grid and answer the following questions.

× 1 2 3 4 5 6 7 8 9 10
1

2
3 6

4
5 35

6

7 28
8

9

10 100
(a) Colour all the multiples of 3 with yellow.

(b) Circle all the even numbers greater than 60 but less than 80.
(c) Colour first 10 multiple of 7 with red.

(d) Is 11 a factor of 54?
(e) Is 7 a factor of 35?
(f) Is 9 a multiple of 27?

(g) Colour first 8 multiples of 5 with green.

(h) Find the common factor of 2 and 5.
(i) Find the common multiple of 7 and 8.
(j) Cross out the odd numbers less than 60 but more than 25.

10. Find the common factors of:
(a) 4, 8 and 12 (b) 35 and 50 (c) 5, 15 and 25 (d) 12 and 15

145 Prime Time