PreAlgebra (Middle School Math)
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Free prealgebra lessons on: types of numbers (numbers and their properties, negative numbers); fractions (reducing, multiplying, dividing, adding and subtracting, mixed numbers, comparing fractions, ratios & proportions, percentages, decimals, scientific notation); factoring (prime numbers and factorization); algebraic expressions (expressions, parentheses, and order of operations, formulas and substitution, variables and word problems); and measurement.  


Levels:  Middle School (68), High School (912) 
Languages:  English 
Math Topics:  Basic Algebra, Fractions/Decimals/Percents, Measurement, Large Numbers, Negative Numbers, Prime Numbers 
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