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Exercises: Simple fractions

Calculate (without a calculator).

$3^{5}$

For this task you need the following basic knowledge: Powers
$3^{5}$ $=$ $3 \cdot 3 \cdot 3 \cdot 3 \cdot 3$
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Calculate step by step.
$=$ $\underset{9}{\underset{⏟}{3 \cdot 3}} \cdot 3 \cdot 3 \cdot 3$
$=$ $\underset{27}{\underset{⏟}{9 \cdot 3}} \cdot 3 \cdot 3$
$=$ $\underset{81}{\underset{⏟}{27 \cdot 3}} \cdot 3$
$=$ $81 \cdot 3$
$=$ $243$
Write out the power.

$[400 - (7 + 3 \cdot 2^{7})] : 3$

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