SSAT Math Question 224: Answer and Explanation
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Question: 224
8. (2.4 × 10x)(3.0 × 10y) =
- A. 72 × 10x + y
- B. 7.2 × 10x + y
- C. 7.2 × 10x + y + 1
- D. 7.2 × 10xy
Correct Answer: B
Explanation:
The answer is B
Multiply the number terms inside the scientific notation first: 2.4 × 3.0 = 7.2. Multiply the exponential expressions with a base of ten. With like bases, add the exponents when you multiply the bases. (10x)(10y) = 10x + y.