# Math

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3.
What is 0.72 written as a simplified fraction? (1 point)

seventy-two over one hundred
one hundred over seventy-two
thirty-six over fifty
eighteen over twenty-five

4.
Ms. Johnson’s class is having a pizza party. If there are 14 students and 7 pizzas cut into 8 slices, what answer choice represents the fraction of one pizza that each student receives? (1 point)

one-third
one-fourth
one-half
one-eighth

5.
What makes the statement true? 8–2 = ? (1 point)

64
16
negative one over sixty-four
one over sixty-four

6.
Based upon the 2010 census data, the total population of the U.S. is 308,745,538 people. Approximately, what is this population in scientific notation? (1 point)

3.1 × 10^8
3.1 × 10^7
3.1 × 10^–8
31 × 10^7

7.
What is the solution to (3 × 102) x (5 × 105) written in scientific notation? (1 point)

1.5 × 10^8
15 × 10^8
1.5 × 10^7
15 × 10^7

8.
If there is one-fourth of a pie, and Amy only wants two over three of it, how much of the pie does she want? (1 point)

one-third
one-fourth
one-fifth
one-sixth

9.
Dory bought 2 computers on sale for \$210.99 each. He sold them to his friend for \$240.00 each. What was his profit? (1 point)

\$52.99
\$58.02
\$421.98
\$480.00

10.
What is 0.00000387 in scientific notation? (1 point)

0.387 × 10^–7
3.87 × 10^–6
3.87 × 10^6
387 × 10^–8

11.
What is thirty-one over four written as a decimal? (1 point)

6.75
7.50
7.75
8.25

12.

The table below shows the populations of four countries for the year 2006 expressed in scientific notation.

Population in 2006
Country Population
Lebanon 3.90 × 10^6
Mexico 1.08 × 10^8
Peru 2.84 × 10^7
Spain 45.5 × 10^6

Of the countries listed, which one had the largest population in 2006?
(1 point)

Lebanon
Mexico
Peru
Spain

13.
What is 2.28 × 10–8 in standard form? (1 point)

228,000,000
22,800,000
0.0000000228
0.000000228

14.
Which of the following appears to be an irrational number? (1 point)

0.404404440…
0.783783783…
negative four over fifteen
square root of thirty-six

15.
Which number is equivalent to 0.3? (1 point)

one-third
thirty-three over one hundred
five-sixths
two-thirds

16.
Jessica went to the mall and used one-sixth of her money on lunch. What is the fraction of her money expressed as a decimal? (1 point)

0.6
0.7
0.16
0.17

17.
Josh has five-eighths of a foot of plywood. To finish building the deck, he needs five times that amount. How many feet of plywood does Josh need? (1 point)

3 feet
3 one-half feet
3 one-eighth feet
3 two-ninths feet

18.
negative tw- thirds + ( negative thre- tenths) = (1 point)

negative five-thirteenths
six over thirty
one over three
negative twenty-nine over thirty

19.
eleven over twelve + negative two over three= (1 point)

one-fourth
thirteen over twelve
negative one-sixth
–negative seven-twelfths

20.
5one-third – three and four-sevenths= (1 point)

two and three fourths
–two and three fourths
one and sixteen over twenty-one
negative one and sixteen over twenty-one

21.
one-half • –one-third (1 point)

–1one-sixth
negative two-thirds
negative three-eighths
–one-sixth

22.
seven over eight ÷ eleven over twelve = (1 point)

seventy-seven over ninety-six
nine-tenths
twenty-one over twenty-two
twenty-two over twenty-one

23.
A length of ribbon is three and one-half yd long. How many pieces one and five-ninths yd long can Joy cut from the length of ribbon? (1 point)

1
2
3
4

24.
2two and seven-fifteenths ÷ 3three and two-thirds = (1 point)

negative thirty-seven over fifty-five
–81two-fifths
–1negative one and eighteen over thirty-seven
–negative twenty-three over fifty-five

3.d
4.b?
5.a
6.b
7.b
8.a
9.b
10.a
11.c
12.b
13.d
14.a
15.a
16.c
17.c
18.?
19.a
20.a
21.d
22.d
23.b
24.a

• Math - ,

#4. c
14 students, 7 pizzas. Doesn't matter how many slices they use.

#5. Not sure, since you botched the exponent. However,
8^2 = 64
8^-2 = 1/64

#6. (a) There are 8 decimal places after the 3.

#7 (a)
3*10^2 x 5*10^5 = 15*10^7 = 1.5*10^8

#8. (d)
1/4 * 2/3 = 2/12 = 1/6

#10. (b)
.387 = 3.87*10^-1
shift left 5 more places and you have 3.87*10^-6

#13. (c)

#15,16 correct, if the final digit repeats.

#18. (d)

#20. (c)
5 1/3 - 3 4/7 = 16/3 - 25/7 = 112/21 - 75/21 = 37/21 = 1 16/21

#22. (c)
7/8 * 12/11 = 84/88 = 21/22

The rest look correct.

Looks like you need to review some more, especially scientific notation.

Plus, what's all the nonsense with words? Real people use digits when talking about numbers. That, and the typos made it hard going.
-2/3 - 3/10 = -(2/3 + 3/10) = -(20/20 + 9/30) = -29/30

• Math - ,

i know Steve it's really weird that my questions are like this but they are.
thanks for helping man.

• Math - ,

hey Steve can you help me with this question also?
A certain computer can perform 10^5 calculations per second. How many calculations can it perform in 10 seconds? (3 points)
10,000,000?

• Math - ,

sorry meant 1,000,000

• Math - ,

Why do you multiply to find the answer to question 8? I also got #8 wrong because I didn't know how to solve it. Can you explain it or tell me where to look to find the right way of completing the problem?

• Math - ,

you were wrong on most of them

• Math - ,

I have a quick qouestion too. Please!!

0.000027/0.000009 how can i show the steps to show it in simplest form?

• Math - ,

divide 27 by 9 duh

• Math - ,

hey you cheat!

• Math - ,

I need help with math