Math
Arithmetic and pre-algebra
The first math topic. Start here if you want to learn the basics (or just want to make sure you know these topics). After this, you should be ready for algebra. This topic includes videos from the former developmental math playlists.
Community Questions
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Addition and subtraction
Adding and subtracting positive and negative whole numbers. Starts with 1+1=2 and covers carrying, borrowing, and word problems.
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Multiplication and division
Multiplying and dividing positive and negative whole numbers, understanding place value, and rounding numbers.
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Factors and multiples
Understanding and finding factors and multiples. After these videos, you'll be ready for fractions.
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Negative numbers and absolute value
Extending our understanding of numbers below 0. Thinking about "absolute" distance from 0.
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Decimals and percent
Understanding decimals conceptually, using operations with decimals, rounding and estimating with decimals, and converting decimals.
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Fractions
Understanding fractions conceptually, using operations with fractions, and converting fractions.
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Ratios, proportions, units and rates
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Exponents, radicals, and scientific notation
Understanding and solving exponents without algebra.
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Applying mathematical reasoning
You already have many tools in your mathematical toolkit. In this topic, you'll use these in settings that you're likely to encounter in the real world!
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Arithmetic properties
Putting names to properties of common arithmetic operations