Charts

Reference tables meant to be printed and taped above the bench or handed around a classroom. Print any of them from the browser — the chrome disappears, the numbers stay.

Fraction → decimal The everyday set, halves through sixteenths. Decimal → fraction The same facts, sorted for lookup by decimal. Fraction → percent The everyday set, read in hundredths. Percent → fraction 50% = 1/2, 33 1/3% = 1/3 — exact, never rounded. Fraction → metric 1/64″ through 1″, each in millimetres. mm → inches Half-mm steps with the nearest 64th and its error. Unit fractions 1/2 through 1/24, repetends shown exactly. Equivalent fractions 1/2 = 2/4 = 4/8, the whole family. Fraction wall One whole cut nine ways, equivalences aligned. Number lines Nine labeled lines from 0 to 1, for the classroom. Printable ruler True-size 6″ and 15 cm, with a calibration bar. Eighths The starter rule, with bar models. 16ths The tape-measure rule. 32nds The machinist’s coarse rule. 64ths The standard drill-chart grid. 128ths As fine as fractional callouts go.

Where this comes from. Exact rational arithmetic on the values shown — fractions are pairs of integers until display, and inch–metric conversion uses 25.4 mm to the inch, exact by definition since 1959. See the full methodology.