Ncert Solutions For Class 7 Maths Ex 9.2

Ncert Solutions For Class 7 Maths Chapter 9 Ex 9.2

 

Q.1.(i) 54+(114)

(ii)53+35

(iii)e910+2215

(iv)311+59

(v)819+(2)57

(vi)23+0

(vii)213+435

Solution:

(i)54+(114)

54+(114)=5114=64=32

(ii)53+35

53+35=5×53×5+3×35×3=2515+915=25+915=3415=2415

(iii)910+2215

910+2215=9×310×3+22×215×2=2730+4430=27+4430=1730

(iv)311+59

311+59=3×911×9+5×119×11=2799+5599=27+5599=8299

(v)819+(2)57

819+(2)57=8×319×3+(2)×157×1=2457+(2)57=24257=2657

(vi)23+0

23+0=23

(vii)213+435

213+435=73+235=7×53×5+23×35×3=3515+6915=35+6915=3415=2415

 

Q.2. Find:

(a)7241736

7241736=7×324×317×236×2=21723472=213472=1372

(b)563(621)

563(621)=5×163×1(6×321×3)=563(1863)=5+1863=2363

(c)613(715)

613(715)=6×1513×15(7×1315×13)=90195(91195)=90(91)195=90+91195=1195

(d)38711

38711=3×118×117×811×8=33885688=335688=8988=1188

(e)2196

2196=19961=19×19×16×91×9=199549=19549=739=819

 

Q.3.(i)92×(74)

92×(74)=9×(7)2×4=638=778

(ii)310×(9)

310×(9)=3×(9)10=2710=2710

(iii)65×911

65×911=(6)×95×11=5455

(iv)37×(25)

37×(25)=3×(2)7×5=635

(v)311×25

311×25=3×211×5=655

(vi)35×(53)

35×(53)=3×(5)5×3=1

 

Q.4. Find the value of:

(i)(4)÷23

(4)÷23=(4)×32=(2)×3=6

(ii)35÷2

35÷2=35×12=(3)×15×2=310

(iii)45÷(3)

45÷(3)=(4)5×1(3)=(4)×15×(3)=415

(iv)18÷34

18÷34=18×43=(1)×12×3=16

(v) 213÷17

213÷17=213×71=(2)×713×1=1413=1113

(vi) 712÷(213)

712÷(213)=712×13(2)=(7)×1312×(2)=9124=31924

(vii)313÷(465)

313÷(465)=313×65(4)=3×(5)1×4=154=334
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