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Math Problems
Grade 8
Multiply numbers written in scientific notation
17
×
16
×
15
×
14
×
13
×
12
×
11
+
5
17\times16\times15\times14\times13\times12\times11+5
17
×
16
×
15
×
14
×
13
×
12
×
11
+
5
is a composite number. Explain why?
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2
×
20
+
(
1
+
7
)
×
3
2\times20+(1+7)\times3
2
×
20
+
(
1
+
7
)
×
3
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Adding and Subtracting Decimals with Helper Gr
\newline
problem.
\newline
\begin{tabular}{r}
\newline
95
95
95
.
90
90
90
\\
\newline
+
28
28
28
.
699
699
699
\\
\newline
\hline
114
114
114
.
599
599
599
\newline
\end{tabular}
\newline
2
2
2
)
\newline
\begin{tabular}{r}
\newline
63
63
63
.
9
9
9
\\
\newline
−
62
-62
−
62
.
704
704
704
\\
\newline
\hline
01
01
01
.
204
204
204
\newline
\end{tabular}
\newline
3
3
3
)
\newline
4
4
4
)
\newline
\begin{tabular}{r}
\newline
9
9
9
. \\
\newline
+
1
1
1
.
74
74
74
\\
\newline
\hline
10
10
10
.
74
74
74
\newline
\end{tabular}
\newline
5
5
5
)
\newline
\begin{tabular}{r}
\newline
74
⋅
5
74 \cdot 5
74
⋅
5
\\
\newline
−
27
⋅
20
-27 \cdot 20
−
27
⋅
20
\\
\newline
\hline
47
⋅
30
47 \cdot 30
47
⋅
30
\newline
\end{tabular}
\newline
6
6
6
)
\newline
7
7
7
)
\newline
\begin{tabular}{r}
\newline
22
22
22
.
7
7
7
\\
\newline
+
2.36
+\quad 2.36
+
2.36
\\
\newline
\hline
\newline
\end{tabular}
\newline
8
8
8
)
\newline
\begin{tabular}{r}
\newline
95
95
95
\\
\newline
+
77
77
77
.
5
5
5
\\
\newline
\hline
\newline
\end{tabular}
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Multiply.
\newline
20
×
1
5
20 \times \frac{1}{5}
20
×
5
1
hour
\newline
20
×
1
5
hour
=
10
×
1
10
=
10
5
=
2
hour
(
s
)
20 \times \frac{1}{5} \text { hour }=\frac{10 \times 1}{10}=\frac{10}{5}=2 \operatorname{hour}(\mathrm{s})
20
×
5
1
hour
=
10
10
×
1
=
5
10
=
2
hour
(
s
)
\newline
(Type whole numbers.)
\newline
Enter your answer in the edit fields and then click Check Answer.
\newline
All parts showing
\newline
Clear All
\newline
Review Progress
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Multiply.
\newline
4
9
⋅
18
\frac{4}{9} \cdot 18
9
4
⋅
18
\newline
[?]
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4
×
3
(
5
+
7
)
−
7
4\times3(5+7)-7
4
×
3
(
5
+
7
)
−
7
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Multiply.
\newline
−
8
(
7
x
2
+
5
)
-8\left(7 x^{2}+5\right)
−
8
(
7
x
2
+
5
)
\newline
Answer:
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Find the sum of the first
45
45
45
terms in this geometric series:
\newline
−
0.5
+
1.5
−
4.5
…
-0.5+1.5-4.5 \ldots
−
0.5
+
1.5
−
4.5
…
\newline
Choose
1
1
1
answer:
\newline
(A)
−
7.39
⋅
1
0
20
-7.39 \cdot 10^{20}
−
7.39
⋅
1
0
20
\newline
(B)
−
4.92
⋅
1
0
20
-4.92 \cdot 10^{20}
−
4.92
⋅
1
0
20
\newline
(C)
−
3.69
⋅
1
0
20
-3.69 \cdot 10^{20}
−
3.69
⋅
1
0
20
\newline
(D)
1.23
⋅
1
0
20
1.23 \cdot 10^{20}
1.23
⋅
1
0
20
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Multiply and simplify the following complex numbers:
\newline
(
5
+
2
i
)
⋅
(
−
5
−
i
)
(5+2 i) \cdot(-5-i)
(
5
+
2
i
)
⋅
(
−
5
−
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
5
−
5
i
)
⋅
(
−
3
+
5
i
)
(5-5 i) \cdot(-3+5 i)
(
5
−
5
i
)
⋅
(
−
3
+
5
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
3
−
4
i
)
⋅
(
−
3
+
2
i
)
(3-4 i) \cdot(-3+2 i)
(
3
−
4
i
)
⋅
(
−
3
+
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
2
+
5
i
)
⋅
(
5
−
3
i
)
(2+5 i) \cdot(5-3 i)
(
2
+
5
i
)
⋅
(
5
−
3
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
4
+
4
i
)
⋅
(
−
2
−
5
i
)
(4+4 i) \cdot(-2-5 i)
(
4
+
4
i
)
⋅
(
−
2
−
5
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
1
−
5
i
)
⋅
(
1
−
2
i
)
(-1-5 i) \cdot(1-2 i)
(
−
1
−
5
i
)
⋅
(
1
−
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
2
−
3
i
)
⋅
(
−
5
−
2
i
)
(-2-3 i) \cdot(-5-2 i)
(
−
2
−
3
i
)
⋅
(
−
5
−
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
4
+
4
i
)
⋅
(
3
+
2
i
)
(-4+4 i) \cdot(3+2 i)
(
−
4
+
4
i
)
⋅
(
3
+
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
4
−
5
i
)
⋅
(
1
−
i
)
(-4-5 i) \cdot(1-i)
(
−
4
−
5
i
)
⋅
(
1
−
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
1
+
2
i
)
⋅
(
1
−
4
i
)
(1+2 i) \cdot(1-4 i)
(
1
+
2
i
)
⋅
(
1
−
4
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
1
−
2
i
)
⋅
(
4
+
i
)
(1-2 i) \cdot(4+i)
(
1
−
2
i
)
⋅
(
4
+
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
1
+
4
i
)
⋅
(
4
−
3
i
)
(-1+4 i) \cdot(4-3 i)
(
−
1
+
4
i
)
⋅
(
4
−
3
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
4
−
4
i
)
⋅
(
−
5
−
3
i
)
(-4-4 i) \cdot(-5-3 i)
(
−
4
−
4
i
)
⋅
(
−
5
−
3
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
1
+
5
i
)
⋅
(
−
3
−
i
)
(1+5 i) \cdot(-3-i)
(
1
+
5
i
)
⋅
(
−
3
−
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
2
+
2
i
)
⋅
(
5
+
5
i
)
(-2+2 i) \cdot(5+5 i)
(
−
2
+
2
i
)
⋅
(
5
+
5
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
2
−
i
)
⋅
(
−
3
+
2
i
)
(2-i) \cdot(-3+2 i)
(
2
−
i
)
⋅
(
−
3
+
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
2
+
4
i
)
⋅
(
5
+
i
)
(-2+4 i) \cdot(5+i)
(
−
2
+
4
i
)
⋅
(
5
+
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
2
−
2
i
)
⋅
(
4
−
4
i
)
(2-2 i) \cdot(4-4 i)
(
2
−
2
i
)
⋅
(
4
−
4
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
3
−
2
i
)
⋅
(
−
4
+
2
i
)
(-3-2 i) \cdot(-4+2 i)
(
−
3
−
2
i
)
⋅
(
−
4
+
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
1
−
3
i
)
⋅
(
−
1
+
i
)
(-1-3 i) \cdot(-1+i)
(
−
1
−
3
i
)
⋅
(
−
1
+
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
4
+
2
i
)
⋅
(
4
−
4
i
)
(-4+2 i) \cdot(4-4 i)
(
−
4
+
2
i
)
⋅
(
4
−
4
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
−
3
−
i
)
⋅
(
3
+
i
)
(-3-i) \cdot(3+i)
(
−
3
−
i
)
⋅
(
3
+
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
1
−
4
i
)
⋅
(
−
4
+
2
i
)
(1-4 i) \cdot(-4+2 i)
(
1
−
4
i
)
⋅
(
−
4
+
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
1
+
i
)
⋅
(
3
−
5
i
)
(1+i) \cdot(3-5 i)
(
1
+
i
)
⋅
(
3
−
5
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
3
−
3
i
)
⋅
(
−
2
+
2
i
)
(3-3 i) \cdot(-2+2 i)
(
3
−
3
i
)
⋅
(
−
2
+
2
i
)
Get tutor help
Multiply and simplify the following complex numbers:
\newline
(
1
−
5
i
)
⋅
(
3
−
2
i
)
(1-5 i) \cdot(3-2 i)
(
1
−
5
i
)
⋅
(
3
−
2
i
)
Get tutor help
