501 Questions To Master GED Test Mathematics_pag24

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501 Questions to Master the GED® Mathematical Reasoning Test
Answers and Explanations
 1. The correct answer is choice c. Sum is a key word that means add. 
You need to add the numbers 12.03 and 4.5. Place the numbers one 
over the other and line up the decimal points.
 12.03
 + 4.5
 Because 4.5 does not show as many decimal places as 12.03, add a 
zero on the end of 4.5 to make 4.50. Then each number will show 
the same number of places to the right of the decimal. These will 
be easier to add.
 12.03
 +4.50
 Now add each column one at a time starting on the right.
 12.03
 +4.50
 16.53
 Choice a is incorrect because this is the difference and not the sum of 
the two given values.
 Choice b is incorrect because you treated the 4.5 as 0.45 and lined up 
the decimals incorrectly.
 Choice d is incorrect because you treated the 4.5 as 45.0 and lined up 
the decimals incorrectly.
 2. The correct answer is 15.5 wpm. To answer this question, it is 
helpful to recall that words per minute is a rate. First, notice that the 
quiz results were for 2 minutes, not 1 minute. We need to find words 
per minute. To do this, simply divide each number of words typed by 
2 to find the words per minute for each person. Since each number 
is being divided by the same number, we only need to do this for the 
greatest number and the smallest number of words typed. 90 words________
2 minutes = 
45 wpm. 59 words________
2 minutes = 29.5 wpm. To find the difference, simply subtract 
29.5 from 45 to get 15.5 wpm. Alternatively, subtract the smallest 
number of words typed from the largest number and divide the dif-
ference by 2.
501_MathQues_01_1-20.indd 9 7/26/17 4:01 PM