निम्न का म.स. ज्ञात कीजिए:
(i) 24 और 36 (ii) 15,25 और 30 (iii) 8 और 12 (iv) 12,16 और 28

Find the HCF and LCM of the following by prime factorisation method : (i) 12 and 15 (ii) 20 and 25 (iii) 28 and 42 (iv) 336 and 56 (v) 12,15 and 21 (vi)10,20 and 30

Simplify: (i) 5/12 xx (-36) , (ii) -17/18 xx 12 , (iii) -5/6 xx 6/5 , (iv) -14 xx 9/28 , (v) -12/5 xx (-15) , (vi) -3/4 by 8/7 , (v) -16/9 by 12/-5 , (vi) 35/(-8) by 12/(-5) (vii) -3/10 by -40/9 , (viii) -32/5 by 15/(-16) , (ix) -8/15 by -25/32

Sides of triangles are given below. Determine which of the them are right angled triangle. (i) 8, 15, 17 (ii) 20,30,40 (iii) 11,12,15 (iv) 20 ,16 ,12

Write true of false. i) 15 : 30 :: 30 : 40, ii) 22 : 11 :: 12 : 6, iii) 90 : 30 :: 36 : 12, iv) 30 : 64 :: 6 : 12, v) 25 : 1 :: 40 : 160.