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Let’s check out your problem:
Add.
\newline
−
8
+
7
2
=
-8 + \frac{7}{2} =
−
8
+
2
7
=
_____
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Math Problems
Grade 7
Add and subtract rational numbers
Full solution
Q.
Add.
\newline
−
8
+
7
2
=
-8 + \frac{7}{2} =
−
8
+
2
7
=
_____
Convert to Improper Fraction:
Convert mixed number to improper
fraction
for easier addition.
\newline
7
1
2
=
(
7
×
2
+
1
)
/
2
=
15
2
7 \frac{1}{2} = (7\times2 + 1)/2 = \frac{15}{2}
7
2
1
=
(
7
×
2
+
1
)
/2
=
2
15
\newline
Calculation:
−
8
+
15
2
-8 + \frac{15}{2}
−
8
+
2
15
Convert to Fraction:
Convert
−
8
-8
−
8
to a fraction to add it to
15
2
\frac{15}{2}
2
15
.
\newline
−
8
=
−
16
2
-8 = -\frac{16}{2}
−
8
=
−
2
16
\newline
Calculation:
−
16
2
+
15
2
-\frac{16}{2} + \frac{15}{2}
−
2
16
+
2
15
Add Fractions:
Add the
fractions
.
\newline
−
16
2
+
15
2
=
−
16
+
15
2
=
−
1
2
-\frac{16}{2} + \frac{15}{2} = \frac{-16 + 15}{2} = -\frac{1}{2}
−
2
16
+
2
15
=
2
−
16
+
15
=
−
2
1
\newline
Calculation:
−
1
2
-\frac{1}{2}
−
2
1
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\newline
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\newline
−
6
=
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−
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\newline
Answer:
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A local package delivery service wants to improve the efficiency of its deliveries. As a first step, the management team decides to conduct a study to determine the average length of time from the arrival of a package at the company's mail center until its delivery at a home. Which of the following methods is most likely to produce valid results?
\newline
Choose
1
1
1
answer:
\newline
(A) The team selects the
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,
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1,000
1
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\newline
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\newline
(Round the answer to the nearest whole number.)
\newline
□
\square
□
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Question
Multiply:
\newline
−
0.1
×
−
2
5
=
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−
0.1
×
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−
2
=
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