Class 6 Exam  >  Class 6 Notes  >  Mathematics (Maths) Class 6  >  RD Sharma Solutions: Playing With Numbers (Exercise 2.9)

Playing With Numbers (Exercise 2.9) RD Sharma Solutions | Mathematics (Maths) Class 6 PDF Download

Q.1. Determine the L.C.M of the numbers given below:

(i) 48,60

(ii) 42,63

(iii) 18,17

(iv) 15,30,90

(v) 56,65,85

(vi) 180,384,144

(vii) 108,135,162

(viii) 28,36,45,60

Ans: 

(i) Prime factorisation of 48 = 2 × 2 × 2 × 2 × 3

Prime factorisation of 60 = 2 × 2 × 3 × 5

∴ Required LCM = 2 × 2 × 2 × 2 × 3 × 5 = 240

(ii) Prime factorisation of 42 = 2 × 3 × 7

Prime factorisation of 63 = 3 × 3 × 7

∴ Required LCM = 2 × 3 × 3 × 7 = 126

(iii) Prime factorisation of 18 = 2 × 3 × 3

Prime factorisation of 17 = 17

∴ Required LCM = 2 × 3 × 3 × 17 = 306

(iv) Prime factorisation of 15 = 3 × 5

Prime factorisation of 30 = 2 × 3 × 5

Prime factorisation of 90 = 2 × 3 × 3 × 5

∴ Required LCM = 2 × 3 × 3 × 5 = 90

(v) Prime factorisation of 56 = 2 × 2 × 2 × 7

Prime factorisation of 65 = 5 × 13

Prime factorisation of 85 = 5 × 17

∴ Required LCM = 2 × 2 × 2 × 5 × 7 × 13 × 17 = 61,880

(vi) Prime factorisation of 180 = 2 × 2 × 3 × 3 × 5

Prime factorisation of 384 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3

Prime factorisation of 144 = 2 × 2 × 2 × 2 × 3 × 3

∴ Required LCM = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 = 5,760

(vii) Prime factorisation of 108 = 2 × 2 × 3 × 3 × 3

Prime factorisation of 135 = 3 × 3 × 3 × 5

Prime factorisation of 162 = 2 × 3 × 3 × 3 × 3

∴ Required LCM = 2 × 2 × 3 × 3 × 3 × 3 × 5 = 1,620

(viii) Prime factorisation of 28 = 2 × 2 × 7

Prime factorisation of 36 = 2 × 2 × 3 × 3

Prime factorisation of 45 = 3 × 3 × 5

Prime factorisation of 60 = 2 × 2 × 3 × 5

∴ Required LCM = 2 × 2 × 3 × 3 × 5 × 7 = 1,260

The document Playing With Numbers (Exercise 2.9) RD Sharma Solutions | Mathematics (Maths) Class 6 is a part of the Class 6 Course Mathematics (Maths) Class 6.
All you need of Class 6 at this link: Class 6
94 videos|347 docs|54 tests

Top Courses for Class 6

94 videos|347 docs|54 tests
Download as PDF
Explore Courses for Class 6 exam

Top Courses for Class 6

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

Viva Questions

,

Playing With Numbers (Exercise 2.9) RD Sharma Solutions | Mathematics (Maths) Class 6

,

Semester Notes

,

study material

,

practice quizzes

,

Free

,

Summary

,

Important questions

,

video lectures

,

pdf

,

MCQs

,

Extra Questions

,

Objective type Questions

,

ppt

,

past year papers

,

mock tests for examination

,

Previous Year Questions with Solutions

,

Playing With Numbers (Exercise 2.9) RD Sharma Solutions | Mathematics (Maths) Class 6

,

Exam

,

Playing With Numbers (Exercise 2.9) RD Sharma Solutions | Mathematics (Maths) Class 6

,

Sample Paper

,

shortcuts and tricks

;