A playground of hands-on tools that do the same math the GED asks about — so you can poke at the numbers and watch how they work instead of just reading about them. No sign-up, no calculator required.
The same amount can be written three ways. You'll be shown one form — pick the matching form from the choices. The full equivalence is revealed after you answer.
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Pick the matching value.
Multiple choice
Order of Operations
The hard part of PEMDAS is knowing what to do first. You're shown an expression — pick the choice that shows the correct next step (parentheses first, then multiply & divide, then add & subtract).
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Which shows the correct next step?
Answer & reveal
Number Line & Negatives
Adding and subtracting negatives trips everyone up. Work out the answer first and type it in — then the number line appears to show you how to picture the jump.
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Practice
One-Step Equation Solver
Solve for x in one move by undoing what's done to it. Get a fresh equation (with negatives), type your answer, and check — the full step-by-step appears either way.
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Quick check
Radius & Diameter
The diameter is always twice the radius; the radius is always half the diameter. Practice flipping between them until it's automatic. Full circle lesson →
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Test yourself
Inequality Sign-Flip
When you multiply or divide both sides of an inequality by a negative, the sign flips. Adding and subtracting never flips it. Drill the rule here. Full inequalities lesson →
Tap a button to test yourself.
Test yourself
Inequality Symbol Matcher
Word problems hide the inequality in phrases like "no more than" or "at least." Match the words to the symbol. Full word-problems lesson →