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Math Problems
Grade 8
Time and work rate problems
100
100
100
men working
8
8
8
hours a day can complete a job in
35
35
35
days. How many men should be employed to finish the job in
25
25
25
days if they work
10
10
10
hours a day?
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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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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 I have
10
10
10
potato chips, I eat
1
1
1
how many i have now ?
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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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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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