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Math Lessons for Adults: From the Basics to GED Level
Rusty on percents, or never quite got slope? These free lessons teach basic math skills that show up on the GED, one at a time, in plain English. Start with the one that worries you most.
- lessons
- 9
- practice questions in each
- 5
- minutes to read, on average
- 5
Numbers, percents and money
About 25% of the testEveryday math, from a sale price at the store to the interest on a loan.
P, E, MD, AS
Order of Operations
Why multiplying comes before adding, and why multiply and divide share one step. Work out a receipt and a split bill, then try five new questions.
5 min read · 5 practice questions
part = % × whole
How to Calculate Percentages
One formula finds the part, the percent or the whole. Work out a tip, a test score and a sale price, then try five new questions.
4 min read · 5 practice questions
I = P × r × t
Simple Interest
What P, r and t stand for, and when to add the interest back on. Work out a car loan and a couch on a payment plan, then try five new questions.
5 min read · 5 practice questions
Geometry and measurement
About 20% of the testYou get these formulas on test day, so the skill is picking the right numbers.
A = b × h
Area of a Parallelogram
Base times height, and why the slanted side never goes in the formula. Work out a parking space and a garden bed, then try five new questions.
4 min read · 5 practice questions
A = ½h(b₁ + b₂)
Area of a Trapezoid
Add the two parallel sides, take half, and multiply by the height. Work out a deck and a garden bed, find a missing height on a roof, then try five new questions.
6 min read · 5 practice questions
V = πr²h
Volume of a Cylinder
The area of the circle on the bottom times the height, and why the radius is half the way across. Work out a soup can, a kiddie pool in gallons and a tank's height, then try five new questions.
6 min read · 5 practice questions
Expressions and equations
About 30% of the testA letter is a number you don’t know yet, and it follows the same rules.
Graphs and lines
About 25% of the testLines on a graph, from how steep they are to the equation that draws them.
m = rise ÷ run
Slope of a Line
Rise over run, plus what a negative, zero or undefined slope looks like. Find slope from two points, a graph and a table, then try five new questions.
8 min read · 5 practice questions
y − y₁ = m(x − x₁)
Point-Slope Form
Put one point and a slope into the formula, then turn it into y = mx + b. Work out a taxi fare and a line through two points, then try five new questions.
6 min read · 5 practice questions
Free printables
Charts to keep next to you while you study, and worksheets with answer keys.
- Printable PDF
Fraction to Decimal Chart
Every fraction from 1/2 to 1/64, with exact decimals and millimeters.
1 page · letter size
- Printable PDF
Perfect Squares Chart
Squares, cubes and square roots for every number from 1 to 30.
1 page · letter size
- Printable PDF
Metric Conversion Chart
Length, weight, volume and temperature, with the exact factors marked.
1 page · letter size
- Printable PDF
Math Formula Sheet
41 formulas, each with a worked example.
2 pages · letter size
- Worksheet maker
GED Math Worksheets
A new worksheet on any topic, with the answer key on its own page.
10 or 20 questions · answer key
How every lesson works
The formula firstWhat each letter stands for, right under the headline.
Worked examplesReal-life problems, solved one step per line.
Mistakes that cost pointsThe traps to watch for, and how to avoid each one.
5 new practice questionsFull working on every answer, and a new set any time you want one.
Not sure where to start?
Take the free practice test. Your results show which skills cost you the most points, so you’ll know which lesson to open first.
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