1:
(i)140=2×2×5×7
(ii)156=2×2×3×13
(iii)3825=3×3×5×5×17
(iv)5005=5×11×7×13
(v)7429=19×23×17
2:
(i)28 and 91
Hcf=7
Lcm=7×4×13=364
28×91=7×364=2548
(ii)510 and 92
Hcf=2
Lcm=2×2×23×17×5×3=23460
510×92=2×23460=46920
(iii)336 and 54
Hcf=6
Lcm=6×9×7×8=3024
336×54=6×3024=18144
3:
(i)12=2×2×3
15=3×5
21=3×7
Hcf=3
Lcm=2×2×5×7×3=420
(ii)17=17×1
23=23×1
29=29×1
Hcf=1
Lcm=17×23×29=11339
(iii)8=2×2×2
9=3×3
25=5×5
Lcm=8×9×25=1800
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Answers & Comments
1:
(i)140=2×2×5×7
(ii)156=2×2×3×13
(iii)3825=3×3×5×5×17
(iv)5005=5×11×7×13
(v)7429=19×23×17
2:
(i)28 and 91
Hcf=7
Lcm=7×4×13=364
28×91=7×364=2548
(ii)510 and 92
Hcf=2
Lcm=2×2×23×17×5×3=23460
510×92=2×23460=46920
(iii)336 and 54
Hcf=6
Lcm=6×9×7×8=3024
336×54=6×3024=18144
3:
(i)12=2×2×3
15=3×5
21=3×7
Hcf=3
Lcm=2×2×5×7×3=420
(ii)17=17×1
23=23×1
29=29×1
Hcf=1
Lcm=17×23×29=11339
(iii)8=2×2×2
9=3×3
25=5×5
Hcf=1
Lcm=8×9×25=1800