Exercise 3A
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
$\begin{aligned}26.&23 \\4.&0 \\0.& 003 \\+9.&01 \\ \hline 39.&243 \\\hline\end{aligned}$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
$\begin{aligned} 1.&100 \\ -0.&011\\\hline 1.&089\\ \hline\end{aligned}$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
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
No comments:
Post a Comment