SChand Composite Mathematics Class 7 Chapter 3 Decimals Exercise 3A

 Exercise 3A

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Q1 | Ex-3A | Class 8 | Decimals |S.Chand | Composite Mathematics | Chapter 3 | myhelper

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Question 1

ADD :

(i) 6.75 , 4.3 , 2.913

$\begin{aligned}6.&75 \\4.&3 \\+2.&913 \\\hline 13.&963 \\ \hline \end{aligned}$

(ii) 0.872 , 3.46 , 4.009  , 4.17 

$\begin{aligned}0.&872 \\3.&46 \\4.&009\\+4.&17 \\\hline 12.&511‬ \\\hline\end{aligned}$

(iii) 16.32 , 20.04 , 5.207 , 0.918 

$\begin{aligned}16.&32 \\ 20.&04 \\ 5.&207\\ +0.&918 \\\hline 42.&485\\ \hline\end{aligned}$

(iv) 0.0804 , 0.00924 , 0.1072 , 0.02065

$\begin{aligned}0.&0804 \\0.&00924 \\0.&1072\\+0.&02065 \\\hline  0.&21749 \\ \hline\end{aligned}$

(v) 26.23, 4.0 , 0.003 , 9.01

$\begin{aligned}26.&23 \\4.&0 \\0.& 003 \\+9.&01 \\ \hline 39.&243‬ \\\hline\end{aligned}$

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Q2 | Ex-3A | Class 8 | Decimals |S.Chand | Composite Mathematics | Chapter 3 | myhelper

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Question 2

Subtract :

(i) 6.473 from 17.589

$\begin{aligned}17.&589 \\-6.&473 \\\hline 11.&116 \\ \hline\end{aligned}$

(ii) 17.182 from 360.05 

$\begin{aligned}360.&05 \\ -17.&182 \\\hline 342.&868 \\ \hline\end{aligned}$

(iii) 0.0093 from 0.045

$\begin{aligned} 0.&045 \\ -0.&0093 \\\hline 0.&0357\\ \hline\end{aligned}$

(iv) 0.376 from 1.0 

$\begin{aligned} 1.&0 \\ -0.&376 \\\hline 0.&624\\ \hline\end{aligned}$

(v) 0.011 from 1.100

$\begin{aligned} 1.&100 \\ -0.&011\\\hline 1.&089‬\\ \hline\end{aligned}$

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Q3 | Ex-3A | Class 8 | Decimals |S.Chand | Composite Mathematics | Chapter 3 | myhelper

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Question 3

Simplify :

(i) 4.105+2.37-5.2

$\begin{aligned} 4.&105\\ +2.&37 \\\hline 6.&475 \\ \hline -5.&2 \\ \hline 1.&275 \\ \hline \end{aligned}$

(ii) 11.001-2.36+4.965-5.7

Sol :

=11.001+4.965-(5.7+2.36)

=15.966-8.06

=7.906

(iii) 100-3.067-33.0689-21.2

=100-(3.067+33.0689+21.2)

=100-57.3359‬

=42.6641‬

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Q4 | Ex-3A | Class 8 | Decimals |S.Chand | Composite Mathematics | Chapter 3 | myhelper

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Question 4

Subtract the difference of 43.375 and 53.9 from the sum of 29.358 and 2.3023

Sol :

Sum of 29.358 and 2.3023

=29.358+2.3023

=31.6603...(i)

Difference of 43.375 and 53.9

=43.875-53.9

=-10.525....(ii)

Difference between (i) and (ii)

(31.6603)-(-10.525)

=31.6603+10.525

=42.1853