Marisol wants to calculate 28 * 5 without a calculator. To make the
calculation easier, she doubles one of the numbers to be 10 and halves the
other. What is answer to her calculation?
A. 170
B. 160
C. 150
D. 140
calculation easier, she doubles one of the numbers to be 10 and halves the
other. What is answer to her calculation?
A. 170
B. 160
C. 150
D. 140
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Answer:
D. 140
Step-by-step explanation:
Because if she added 5 in the 5 it will be 10 and if she subtract 14 over 28 it will be 14 then after that you have to find the product of 14 * 10 so the answer will be 140.
5+5=10
28-14=14
Then..
14*10=140