S.chand publication New Learning Composite mathematics solution of class 7 Chapter 3 Rational numbers Exercise 3D

 Exercise 3D


Q1 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 1

Find Each Sum

(a) 12+(78)

Sol :

=1278

=478=38


(b) 14+(712)

Sol :

=14712

=3712=1012

=56


(c) 435+(7110)

Sol :

=4357170

=867110=1510=32


(d) 1715+(1930)

Sol :

=22151930

=441930=6330

=2110



Q2 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 2

Subtract:

(a) 113 from 526

Sol :

=526113

=5×11×226

=5226=726


(b) 815from 1130

Sol :

=1130(815)

=1130+815

=11×1+8×230=11+1630

=+530=16


(c) 1425 from 3750

Sol :

=37501425

=157502925

=21550=4310


(d) 1311 from 3522

Sol :

=3522(1311)

=7122+1411

=9922=412



Q3 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 3

Add.

(a) 78 and 511

Sol :

=78+511=77+4088

=3788


(b) 123 and 215

Sol :

=53115

=253315=815


(c) 137 and 138

Sol :

=137+138

=107+118

=807756

=356


(d) 14711 and 35910

Sol :
=14711+(35910)

=1611135910

=5559110=5059110



Q4 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 4

(a) 37 from 59

Sol :

=5937

=5937

=352763=6263


(b) 922 from 521

Sol :

=521(922)

=521+922

=110+189462

=79462


(c) 117 and 2310

Sol :

=2310(117)

=2310+87

=161+8070=8170

=11170


(d) 658 from 1411

Sol :

=1511+538

=120+58388=70388

=78788



Q5 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 5

Find the sum.

(a) 1720+(1925)

Sol :

=17201925

=8576100=161100

=161100


(b) 158+912

Sol :

=158+912

=138912

=391824=2124


(c) 256+2914

Sol :

=176+3714

=119+11142

=842

=421



Q6 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 6

Subtract:

(a) 138 from 5712

Sol :

=6712+118

=134+3324

=16724=62324


(b) 1415 from 1120

Sol :

=1120(1415)

=1120+1915

=33+7660=4360


(c) 4710 from 1825

Sol :

=18254710

=8254710

=3623550=27150

=52150



Q7 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 7

Simplify:

(a) 10+(615)

Sol :

=1615


(b) 1980(3)

Sol :

=26180


(c) 1819+11382757

Sol :

=25114


(d) 517+(25)

Sol :

=5985


(e) 6+911

Sol :

=5211


(f) 518+1724+129362

Sol :

=8572



Q8 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 8

597122(56)

Sol :

=59+7122+56

=202172+3036=4136=1536



Q9 | Ex-3D | Class 7 | Rational Numbers | SChand | New Learning Composite Maths | Chapter 4 | myhelper

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Question 9

Subtract (37+59) from the negative of 863

Sol :

863(37+59)

=863(3759)

=86337+59

=827+3563

=0

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