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Math basics
A quick review of elementary school math for anyone with a few gaps, so you can start Pre-algebra on solid ground. Every lesson has examples worked step by step, practice problems with solutions and a quick check at the end.
Before you start: None: you just need to be able to read numbers.
Unit 1 Numbers and operations
- 1 Place value, comparing and rounding How the base-ten system works, the value of a digit in each place, reading and writing large numbers, expanded form, comparing numbers and rounding. 9 min
- 2 Adding and subtracting multi-digit numbers The standard algorithm for addition and subtraction with regrouping, checking your work, lining up decimals, and mental math shortcuts. 10 min
- 3 Multiplication facts and multi-digit multiplication The multiplication table, strategies for learning the facts, the standard algorithm for multi-digit multiplication, mental math and multiplying decimals. 11 min
- 4 Long division Dividend, divisor, quotient and remainder, the long division steps (divide, multiply, subtract, bring down), zeros in the quotient, two-digit divisors and checking your answer. 12 min
Unit 2 Measurement and shapes
- 5 Units of measure and conversions US customary units for length, weight and capacity, the metric system, converting between units by multiplying or dividing, and converting units of time. 11 min
- 6 Perimeter and area of simple shapes The difference between perimeter and area, formulas for rectangles, squares and triangles, composite figures and real-world problems with flooring, fencing and paint. 11 min