Math

posted by Cami

So I have some math questions I'd like for some one to check :)

1. Rename 4/7 as a percent. Round to the nearest tenth of a percent if necessary.
A. 47%
B. 1.8%
C. 57.1%
D. 28%

2. Rename .709 as a percent.
A. 709%
B. 70.9%
C. 79%
D. 7.09%

3. Alice plays basketball. In one she shoot 21 free throws and makes 81.25% of them. Estimate how many free throws she makes?
A. About 16
B. about 2
C. About 20
D. About 14

4.Estimate 48% of 23.95
A. About $12.00
B. About $11.00
C. About $15.00
D. About $10.00

5. The bill at a restaurant is $58.50 and mrs. Johnson wants to leave a 15% tip. Approximately how much money should she leave?
A. About $15.00
B. About $9.00
C. About $6.00
D. About $11.00

6. What percent of 50 is 12.5?
A. 4%
B. 25%
C. 40%
D. 15%

7. 50 is 6.25% of what number?
A. 8
B. 80
C. 750
D. 800

8. Which proportion can be used to solve the following percent problem? What is 50% of 70%?
A. x/70 = 50/100
B. x/50 = 70/100
C. 50/70 = x/100
D. 70/x = 50/100


My answers:
4/7 as a percent. Round to the nearest tenth of a percent
= 0.57142 = 57.142% = 57.1% C

.709 as a percent
70.9% B

81.25% of 21 = about 16 A

48% of 23.95 = about 12.00 A

15% of $58.50 = about 5.8 + 2.9 = 8.7 = about 9 B

50 is 12.5?
12.5/50 = 25/100 = 25% B

50 is 6.25% of what number
50 = 0.625 times X
So x = 50/0.625 = 80 B

50% of 70% = 35
So the proportion would x/70 = 50/100 A

  1. Ms. Sue

    This answer is wrong:
    7.
    50 is 12.5?
    12.5/50 = 25/100 = 25% B

    The rest are correct.

  2. Cami

    Oh, thank you Mrs.Sue :)!!

  3. Ms. Sue

    You're welcome, Cami.

  4. Bosnian

    Question 8

    x / 70 = 50 / 100 Multiply both sides by 100

    100 x / 70 = 50 Multply both sides by 70

    100 x = 50 * 70

    100 x = 3500 Divide both sides by 100

    x = 3500 / 100 = 35


    x / 50 = 70 / 100 Multiply both sides by 100

    100 x / 50 = 70 Multply both sides by 50

    100 x = 70 * 50

    100 x = 3500 Divide both sides by 100

    x = 3500 / 100 = 35

    Answers A and B are the same.

  5. I LOST, 43 MILLION DOLLARS AND I DID IT DELIBERATELY

    SOME question doesn't mean two questions

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