CPM Homework Help : CC1MN Problem 9-56

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9-56.

Calculate each of the following products without using a calculator.

$\frac { 7 } { 8 } \cdot \frac { 5 } { 6 }$
Hint (a):
$\frac{a}{b}\cdot\frac{c}{d}=\frac{a \cdot\ c}{b \cdot\ d}$

$(3.1)(0.02)$
Hint (b):
Use a generic rectangle, as shown below.
Left edge $0.02$
Interior left blank
interior right blank
bottom edge left $3$
bottom edge right $0.1$

$1 \frac { 3 } { 5 } \cdot 2 \frac { 1 } { 3 }$
Hint (c):
Change the mixed numbers into fractions and then refer to part (a) for help.

$\frac { 2 } { 3 } \cdot \frac { 20 } { 7 }$
Answer (d):
$\frac{40}{21}=1\frac{19}{21}$

Compute without a calculator

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