Math that
shows its work.
No answer-only black boxes. Long division in the full bracket layout, GCF with factor trees, medians that sort themselves in front of you, row reduction with every operation written down.
Every calculator on this page renders its working like this — digit by digit, branch by branch, row by row.
- 16
- Calculators, all showing the working
- 100%
- Client-side — nothing leaves your browser
- 0
- Sign-ups, paywalls or answer paywalls
- ∞
- Shareable worked examples via URL
Averages, long division, GCF and LCM — the core skills, with every move written out.
Average Calculator
Type in any list of numbers and get the mean instantly — with every step of the working shown, plus the median, mode and range so you can see the whole picture of your data.
Shows the workingLong Division Calculator
Enter a dividend and a divisor and watch the bracket method unfold digit by digit — every multiplication, subtraction and bring-down, exactly as you would write it on paper.
Full written methodPercentage Decrease Calculator
From a starting value to a new one — see exactly how big the drop is as a percentage, with each step of the calculation written out.
GCF Calculator
Enter two, three or four whole numbers and see the GCF emerge from factor trees and prime factorizations — not just an answer, but the whole argument for it.
Factor trees includedLCM Calculator
The smallest number that every input divides into — worked out by prime factorization, with a listing check you can verify by eye.
Mixed numbers, simplifying and proportions — the parts-of-a-whole toolkit.
Mixed Number Calculator
Switch between mixed numbers and improper fractions in either direction — with the multiply-add-split method written out at every step.
Both directionsSimplify Calculator
Enter a fraction and watch it shrink to simplest form — the GCF found, the division shown, and the mixed-number equivalent included when it applies.
Proportion Calculator
Fill in any three boxes of a proportion and the fourth is solved by cross-multiplication — with each algebraic move written out.
Surface area and volume, built up face by face instead of recited from a formula sheet.
Surface Area Calculator
Pick a solid, enter its measurements and see the surface area built up face by face — no magic formula, just the pieces added together in front of you.
Face-by-face workingCylinder Volume Calculator
Radius and height in, volume out — with the three moves of V = πr²h written out, and the answer in both exact π form and decimals.
Median to variance, RREF to eigenvectors — the student tier, from GCSE to linear algebra.
Median Calculator
Enter your numbers and watch them sort themselves — the middle value is highlighted, and for even-sized lists the two-middle average is worked out in full.
Sort visualizedMean, Median & Mode Calculator
Paste in a data set once and get all three measures of centre — the equal-share mean, the middle-value median and the most-frequent mode — each with its working shown.
Three in oneVariance Calculator
How spread out is your data? Get the variance and standard deviation with the full deviation table worked out row by row.
Interpolation Calculator
Know two points on a line? Estimate any value between them — with the slope, the formula and the arithmetic all written out, plotted as you go.
RREF Calculator
Paste a matrix (optionally augmented with a constants column) and watch Gauss-Jordan elimination move by move — each row operation written out, each pivot highlighted.
Every row op shownEigenvector Calculator
Enter a 2×2 or 3×3 matrix and get its eigenvalues and eigenvectors with the full derivation — characteristic equation, roots, and the row reduction behind each eigenvector.
Times-table & place-value charts
Interactive charts that print as clean worksheets — multiplication 1–12 and 1–20, blank practice grids, division charts and the place-value chart.