Cal earned $8.20 an hour at his eight hour a day job. He worked five days a week. How much did cal earn a week?
2 answers:
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Answer:
102
Step-by-step explanation:
Step 1: ask your calculator. It will tell you ...
0.68 × 150 = 102
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Many calculators will deal with percentages directly. If yours doesn't, you may need to convert the percentage to a decimal fraction. Since "%" means the same thing as "/100", you know that 68% is the same as 68/100, or 0.68 (sixty-eight hundredths).
Using your multiplication skills, you can do this in your head with a simple transformation of the problem:
0.68×150 = 68×1.50 . . . . multiply one factor by 100; divide the other factor by 100
= 68×1 +68×0.50 . . . . . . use the distributive property
= 68 + 68/2 . . . . . . . . . . . recognize multiplying by 0.5 is dividing by 2
= 68 +34 = 70 +32 . . . . . rearrange the addition to simplify, if you like
= 102
