Notes on Artithmetic

Conversions

• Fraction to Percent
  • Concert Fraction to Decimal, then Decimal to Percent. E.g.: $$\frac{4}{5}=0.8 = 80%$$
  • Common Fraction-Percents: 1/20=5%; 1/2=10%; 3/20= 15%; 1/5=20%; 1/4=25%; 3/10=30%; 1/3=33.33%; 2/5=40%; 1/2=50%; 3/5=60%; 2/3=66.66%; 7/10=70%; 4/5=80%; 9/10=90%
• Percent to Fraction
  • E.g.: $$20%=\frac{20}/{100} =\frac{1}/{5}$$
• Decimal to Percent
• Percent to Decimal

Ratio

Interest