How to turn a decimal into a fraction on a TI-84 Plus or TI-83 Plus

By E-Code · updated 2026-09-27

Type the decimal, press MATH, 1 for ►Frac and ENTER: .375 becomes 3/8. MATH 2 (►Dec) and ENTER turn the answer back into a decimal.

Step by step

1. Type a decimal. . 3 7 5 Type .375.
2. Open MATH. MATH Press MATH. The first two items are ►Frac and ►Dec.
3. Pick ►Frac. 1 Press 1 for ►Frac. It shows a number as a fraction.
4. Get the fraction. ENTER Press ENTER.
5. Back to MATH. MATH Press MATH again.
6. Pick ►Dec. 2 Press 2. On a new line the calculator writes Ans►Dec: your last answer, 3/8, as a decimal.
7. Back to a decimal. ENTER Press ENTER.
8. Both ways. .375 is 3/8. ►Frac gives the fraction when there is one, and ►Dec turns a fraction back into a decimal.

What the screen shows

.375 is 3/8. ►Frac gives the fraction when there is one, and ►Dec turns a fraction back into a decimal.

Look for Ans►Dec .375 on the screen.

Try it with the keys lit up

This guide is one of E-Code's Learn lessons. Open it on E-Code's TI-84 calculator and each key lights up in turn as you press it.

Try “Turn a decimal into a fraction” on the TI-84 calculator

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