shaonirak
Hi, why do we not approximate 1.5 as fifteen? I did that and got the answer as 400. I think i am missing something here. Could you please help me out?
Catman
\(\frac{(1.5)(19.9)(4.012)}{3.02}\)
Using approximation taking 19.9 as 20 , 4.012 as 4 and 3.02 as 3
we get
\(\frac{(1.5)(20)(4)}{3}\)
=40.
Hence Choice D.
Approximating a number when estimating an expression means finding a simpler, more convenient value that is close to the original number, usually an integer, especially when approximating fractions. Approximating 1.5 as 15 increases its value by 10 times, which drastically changes the calculation. To maintain balance, you would also need to either approximate another number in the numerator to be 10 times smaller or adjust a number in the denominator to be 10 times larger. Otherwise, the entire fraction's value becomes incorrect.