UnfoldMath

Step by Step Math, Unfolded for Kids

Our calculators
✖️
Column Multiplication
Multiply any two whole numbers step by step. Watch carries appear in real time as each digit is processed — just like your teacher shows it.
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🔢
Decimal Multiplication
Multiply numbers with decimal points and see every step explained — including how to count decimal places and where to put the point in the answer.
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➗
Long Division
Divide step by step with remainders shown at each stage — watch each digit of the quotient appear as the working unfolds, just like on paper.
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➕
Column Addition
Add large numbers in columns with carries explained and animated at each step — watch each digit land in the right place.
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➖
Column Subtraction
Subtract step by step with borrowing explained visually — no more confusion about why you cross out a digit and what happens next.
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Coming soon
½
Fraction Addition
Add fractions step by step — finding common denominators, converting, and simplifying the result, all animated.
Coming soon
Coming soon
½
Fraction Subtraction
Subtract fractions step by step with visual explanations of borrowing across the numerator and denominator.
Coming soon
Coming soon
½
Fraction Multiplication
Multiply fractions step by step with visual explanations of numerators, denominators, and simplification.
Coming soon
How it works
1
Enter your numbers
Type the numbers you want to calculate — whole numbers, decimals, or fractions depending on the tool.
2
Watch it unfold
Each digit is highlighted and processed one at a time. Carries and borrows appear exactly when they should, just like on paper.
3
Read the explanation
Written step-by-step notes below the grid explain every operation in plain language a child can follow.
Why step-by-step matters

Free math calculators that show every step

Unfold Math is a collection of free animated calculators for elementary school arithmetic. Every tool covers one operation — multiplication, division, addition, subtraction, decimals — and walks through the calculation digit by digit, exactly the way it is taught on paper. Carries fly to the right column, borrows are crossed out visually, partial products stack up in the right order. Nothing is skipped.

Why animated tools help kids learn

Seeing the answer is not the same as understanding the method. Static worked examples help, but animated step-by-step tools that highlight the active digit and reveal carries at exactly the right moment allow students to follow the logic in real time. They can pause, step back, re-run the calculation with different numbers, and build genuine intuition for why the algorithm works — not just how to execute it.

Who these tools are for

Unfold Math is designed for children in elementary school — typically ages 6 to 12 — and for the parents and teachers who sit with them. Every calculator is completely free, works on any device without an app or account, and is available in English, Spanish, Italian, and Portuguese. The tools are also useful for older students revisiting foundational concepts and for teachers looking for clear visual demonstrations to show in class.