Question

$(2.5\times 0.5)+(1.3\times 0.3)-(1.4\times 0.2)$ = _____

• A. 1.28
• B. 1.33
• C. 1.36
• D. 1.42

Answer 1

The correct option is C 1.36

$(2.5\times 0.5)+(1.3\times 0.3)-(1.4\times 0.2)$

$2.5\times 0.5=1.25(\because 25\times 05=125)$
(Shifting the decimal point two places to the left)

$1.3\times 0.3=0.39(\because 13\times 03=39)$
(Shifting the decimal point two places to the left)

$1.4\times 0.2=0.28(\because 14\times 02=28)$
(Shifting the decimal point two places to the left)

$\therefore (2.5\times 0.5)+(1.3\times 0.3)-(1.4\times 0.2)=1.25+0.39-0.28$

On adding 1.25 and 0.39,

$\begin{array}{ccc}1& & \\ 1.25& & \\ \underset{–}{+0.39}& & \\ 1.64& & \end{array}$

Now, subtract 0.28 from 1.64,
$1.\text{/}{6}^5\text{/}{4}^{14}\underset{–}{-0.28}\underset{–}{1.36}$