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Math Problems
Grade 8
Time and work rate problems
Pwint is
60
k
g
60 \mathrm{~kg}
60
kg
heavier than Sandi. She is
5
5
5
times as heavy as Sandi. What is the total mass of Pwint and Sandi?
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4
4
4
. (
2
2
2
P) Ein Astronaut mit Raumanzug hat die Masse
150
k
g
150 \mathrm{~kg}
150
kg
.
\newline
a) Welche Kraft muss ein Sitz für den Astronauten aushalten, der auf dem Mond bzw. auf der Erde steht. (Schwerkraft)
\newline
b) Zum Vergleich: Wie groß ist die benötigte Kraft, um den Astronauten innerhalb von
100
100
100
c
m
\mathrm{cm}
cm
von einer Horizontalgeschwindigkeit
40
k
m
/
h
40 \mathrm{~km} / \mathrm{h}
40
km
/
h
auf
0
k
m
/
h
0 \mathrm{~km} / \mathrm{h}
0
km
/
h
abzubremsen?
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Brain Builders
\newline
3
3
3
. A community center is organizing a dance. There are four large columns arranged at the corners of a square. The decorating committee will hang three large streamers from each column to every other column. How many streamers are needed?
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Hansraj wants to find the least number of boxes to be added to get a perfect square. He already has
7924
7924
7924
boxes with him. How many more boxes are required?
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If there is
48
48
48
children
20
20
20
is girls what are the fraction of boys
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13
13
13
. Liz has a recipe that uses
1
1
3
1 \frac{1}{3}
1
3
1
cups of sugar and
2
1
4
2 \frac{1}{4}
2
4
1
cups of flour to make
18
18
18
muffins. She has a total of
9
9
9
cups of flour. Liz wants to use all of her flour to make as many muffins as possible using this recipe.
\newline
A. Exactly how many cups of sugar will Liz use if she uses all
9
9
9
cups of flour?
\newline
B. Exactly how many muffins will Liz make if she uses all
9
9
9
cups of flour?
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PREVIOUS ANSWER:
\newline
15
5
∘
155^{\circ}
15
5
∘
\newline
JUSTBASICS
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Some penguins were playing on the ice.
8
8
8
dove into the water.
5
5
5
of those penguins jumped back onto the ice.now there are
13
13
13
on Thai r. How many penguins were on the ice to start?
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20
20
20
is added to a mystery number. The result is multiplied by
5
5
5
. After that
43
43
43
is subtracted. The final value is
352
352
352
. What was the mystery number at the beginning?
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EN: Determine the minimum number of students required in a class to ensure that at least three of them celebrate their birthdays in the same month.
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Abby and Raju had the same number of marbles at First. After Raju bought another
37
37
37
marbles and Abby gave
65
65
65
marbles away, they has a total of
284
284
284
marbles together left. How much marbles each of them have at First?
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A jeweler in Hillsboro examined which metals her customers selected for wedding bands last year.
\newline
Wedding ring preference
\newline
If there were
110
110
110
rings in total, how many more rir were silver than gold?
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Gabrielle's age is two times Mikhail's age. The sum of their ages is
66
66
66
. What is Mikhail's age?
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Volume \& Surface Area
\newline
Question
7
7
7
of
15
15
15
(
1
1
1
point) | Question Attempt:
1
1
1
of
3
3
3
\newline
Your answer is incorrect.
\newline
The large solid below is made from small cubes. Each has a side length of
1
5
f
t
\frac{1}{5} \mathrm{ft}
5
1
ft
.
\newline
Answer the questions below. Write your answers in simplest form.
\newline
(a) How many small cubes is the large solid made of?
\newline
(b) What is the volume of one of the small cubes?
\newline
(c) What is the volume of the large solid?
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Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has
9
9
9
dots in a row. How many dots will her Rangoli have for
r
r
r
rows? How many dots are there if there are
8
8
8
rows? If there are
10
10
10
rows?
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If I have
10
10
10
potato chips I eat
1
1
1
how many i have now ?
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Matthew has
35
35
35
dollars more than his friend. If they have
100
100
100
dollars all together. w much does Matthew have?
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4
4
4
. The World Series in baseball continues until either the American League team or the National League team wins four games. How many different orders are possible (e.g., ANNAAA means the American League team wins in six games) if the series goes
\newline
(a) Four games?
\newline
(b) Five games?
\newline
(c) Six games?
\newline
(d) Seven games?
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Betty had
100
100
100
muffins in the morning.
\newline
She gave away some muffins.
\newline
She baked another
35
35
35
muffins in the afternoon and sold all
80
80
80
muffins she had.
\newline
How many muffins did she give away?
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Use the order of operations to solve the expression.
\newline
−
3
2
+
(
−
4
)
2
+
1
2
(
8
)
-3^{2}+(-4)^{2}+\frac{1}{2}(8)
−
3
2
+
(
−
4
)
2
+
2
1
(
8
)
\newline
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Third question. A statue was planned to be built by
40
40
40
people and completed in
15
15
15
days. If it were to be completed
3
3
3
days earlier, how/ many more pecple would you need?
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Rita baked
3
3
3
tomes as many chocolate cookies as butter cookies. After selling
60
60
60
chocolate cookies and
12
12
12
butter cookies, there were
3
3
3
times as many butter cookies as chocolate cookies. How many chocolate cookies did Rita bake at first?
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Rachel has
7
15
\frac{7}{15}
15
7
of her project done. If she can finish
7
45
\frac{7}{45}
45
7
of her project each day, how many more days will it take her to complete it?
\newline
It will take her _________more days.
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A bag contains
2
2
2
red marbles,
7
7
7
blue marbles and
4
4
4
green marbles. If two marbles are drawn out of the bag, what is the probability, to the nearest
10
10
10
ooth, that both marbles drawn will be red?
\newline
Answer:
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A bag contains
5
5
5
red marbles,
6
6
6
blue marbles and
7
7
7
green marbles. If two marbles are drawn out of the bag, what is the probability, to the nearest
10
10
10
ooth, that both marbles drawn will be green?
\newline
Answer:
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Sweet Time Bakery just opened and is increasing the number of items they bake. For example, the bakery made
36
36
36
carrot cakes in December,
49
49
49
carrot cakes in January,
64
64
64
carrot cakes in February, and
81
81
81
carrot cakes in March. What kind of sequence is this?
\newline
Choices:
\newline
(A) arithmetic
\newline
(B) geometric
\newline
(C) both
\newline
(D) neither
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Brian irons
2
9
\frac{2}{9}
9
2
of his shirt in
3
3
5
3 \frac{3}{5}
3
5
3
minutes. Brian irons at a constant ra At this rate, how much of his shirt does he iron each minute?
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John can clear a lot in
1.5
1.5
1.5
hours. His partner can do the same job in
8.5
8.5
8.5
hours. How long will it take them to clear the lot working together?
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George can cut and split a cord of firewood in
3
3
3
fewer hours than SkylerSkyler can. When they work together, it takes them
2
2
2
hours. How long would it take each of them to do the job alone?
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The great snipe can fly up to
4
4
4
,
000
000
000
miles (
m
i
\mathrm{mi}
mi
) without stopping for food or water at a speed of
60
60
60
miles per hour
(
m
p
h
)
(\mathrm{mph})
(
mph
)
. What is the maximum number of days, to the nearest tenth, that the great snipe can fly without stopping?
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Magie can type
5
5
5
letters in
20
20
20
min - and Suying can type
2
2
2
letters in
10
10
10
min. Working together and assuming each letter is the same length. How many minutes will, to take them to type
45
45
45
letters?
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