Practice Quiz

GMAT Math Practice Test #1

Category - Math

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If x=0.1, what is the value of 98x2-16.8x-1.7?
  1. -0.72
  2. -1.42
  3. -1.98
  4. -2.40
  5. -2.89
Explanation
Answer D- 98x2-16.8x-1.7 = 98 (0.1)2 - (16.8) (0.1) -1.7 = 0.98 -1.68 -1.7 =-2.40

Key takeaway: When you multiply a decimal number by another decimal number, the decimal shifts to the left. Count and total the number of digits to the right of the decimal points in all of the numbers you are multiplying and place the decimal in that position counting the digits from the right of the product.
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