A free mental math learning academy
Explore friendly, step-by-step mental math strategies. Start with one idea, see it worked through, and try a quick check for understanding — all completely free.
A small shift can make math simpler
39 + 26
65 — same sum, easier steps.
A calmer way to get quicker
Mental math gets easier when you have more than one way to think about a problem. These original lessons explain useful mental math tricks, show each step, and point out common mistakes. Take the strategy that makes sense to you; there is no timer and no paywall.
Choose your starting point
Pick a topic and explore every lesson in order, or jump straight to a strategy you need.
Build totals in your head with friendly numbers, useful splits, and calm left-to-right thinking.
Find differences by counting up, taking manageable chunks, and balancing both numbers.
Turn products into patterns with times tables, doubling, distribution, and place value.
Share and group numbers using factors, smaller steps, and multiplication to check your work.
See why square numbers grow the way they do and use nearby numbers to calculate them.
Find useful percentages, estimate larger amounts, and understand discounts without a calculator.
A good place to begin
Short, practical lessons with worked examples and a quick interactive check.
Learn the make-ten mental math trick: move just enough from one addend to make the other a friendly ten.
Read the lesson 02 · SubtractionCount up from the smaller number to the larger one using friendly jumps to find a subtraction difference.
Read the lesson 03 · MultiplicationSplit a factor into convenient addends, multiply each part, and add the partial products.
Read the lesson 04 · PercentagesFind 10%, 5%, and 1% of a number mentally, then combine those easy building blocks into other rates.
Read the lessonReady to put it into practice?
Choose an operation, set a comfortable range, and solve a few questions in your head.
