Derek W. answered • 09/23/14
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Chemistry Grad Loves Teaching Math and Science
This question involves fractions and conversion to a percentage. We know that the total number of cards that Eli plans to send is 40. This means that this number will appear on the bottom of the fraction in the "denominator". This represents the most that she would make overall. The number of cards that Eli has finished is 29. This number appears on the top of the fraction in the "numerator". We now have the fraction 29/40. Using our calculator to simplify this fraction, we get 0.725, but WE ARE NOT DONE! To convert a decimal to a percentage, we multiply our answer by 100. Multiplying 0.725 by 100 gives us a value of 72.5%. Eli has finished 72.5% of her cards.
Are you concerned with significant figures? If no, STOP and go back to the previous paragraph. If yes, the smallest number of significant figures is 1 because the number 40 has 1 significant figure. Rounding the value of 72.5% to 1 significant figure, we get a value of 70%.
