\[\frac{4}{5}\]
1
For the denominator, recognize that 5×20=1005\times 20=100.
Multiple = 2020

2
Multiply both the numerator and denominator by the multiple 2020.
4×205×20\frac{4\times 20}{5\times 20}

3
Simplify.
80100\frac{80}{100}

4
Simplify.
80%80\%

Done

Decimal Form: 0.8
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