K–12 · foundations
Pre-Algebra
Fractions, ratios, percents, and the language of variables.
Skills
14 skills in 2 sections — fundamentals first, then more specific topics. Practice each until Mastery Score 100.
A.Fractions7 skills
- A.1 Simplifying FractionsPractice →Reduce a fraction to lowest terms.
- A.2 Mixed Numbers to Improper FractionsPractice →Rewrite a mixed number as an improper fraction.
- A.3 Adding FractionsPractice →Add fractions with unlike denominators; simplify.
- A.4 Subtracting FractionsPractice →Subtract fractions with unlike denominators; simplify.
- A.5 Multiplying FractionsPractice →Multiply fractions and simplify.
- A.6 Dividing FractionsPractice →Divide fractions by multiplying by the reciprocal.
- A.7 Fractions to DecimalsPractice →Convert fractions with friendly denominators to exact decimals.
B.Ratios & percents7 skills
- B.1 Simplifying RatiosPractice →Reduce a ratio a:b to lowest terms.
- B.2 Unit RatesPractice →Find unit rates from ratios.
- B.3 Solving ProportionsPractice →Solve a/b = x/c for the unknown value.
- B.4 Percents & DecimalsPractice →Convert between percent form and decimal form.
- B.5 Percent of a NumberPractice →Compute a percent of a whole number.
- B.6 Finding the Whole from a PercentPractice →Given a part and its percent, find the whole.
- B.7 Percent Increase & DecreasePractice →Find the percent change between an old and a new value.