Question

Exercise - 3.6
Find the LCM of the following numbers by prime factorisation method.
(i) 12 and 15
(ii) 15 and 25
(iii) 14 and 21
Find the LCM of the following numbers by division method.
(i) 84, 112, 196
(ii) 102, 119, 153 (iii) 45, 99, 132, 165
Find the smallest number which when added to 5 is exactly divisible by 12, 14 and 18
Find the greatest 3-digit number which when divided by 75, 45 and 60 leaves
(i) No remainder
(ii) The remainder 4 in each case.
Two bells ring together. If the bells ring at every 3 minutes and 4 minutes respective
at what interval of time, will they ring together again?​

Answer 1

Step-by-step explanation:

15 - 3×5

12- 2×3 ×2

= 3×2×2×5

=6×2×5

=12×5

=60

Answer 2

Answer:

LCM of the following numbers by prime factorisation method

i. 60

ii. 75

iii. 42

LCM of the following numbers by division method

i. 2×7×6×8×13

ii.

iii.

smallest number is 1

7 min.

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