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  4. The area of a square is 5.29 cm2. The area of 7 such squares taking into account the significant figures is :

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Q. The area of a square is $5.29 \; cm^2$. The area of $7$ such squares taking into account the significant figures is :

JEE MainJEE Main 2019Physical World, Units and Measurements

Solution:

Total Area = $A_1 + A_2 + ...... A_7$
= $A + A + ......... 7$ times
= $37.03\, cm^2$.
Addition of $7$ terms all having $2$ terms beyond decimal, so final answer must have $2$ terms beyond decimal (as per rules of significant digits.)