TI-15 Explorer™ Online Calculator

An interactive, browser-based TI-15 calculator built for mastering elementary math, stacked fractions (n/d), simplification (Simp), integer division (Int÷), decimal rounding (Fix), and practice modes (Auto/Man).

TEXAS INSTRUMENTS TI-15 Explorer™

TI-15 Math Explorer

AUTO

How to Use the TI-15 Explorer Calculator

Step-by-step key sequence examples to master every feature on the TI-15 simulator.

1. Stacked Fractions

Entering & Adding Fractions (`n/d`)

Input stacked numerator/denominator fractions and calculate exact fraction addition.

Problem: Calculate $\frac34 + \frac14$

Press 3 → Press n/d → Press 4
Press +
Press 1 → Press n/d → Press 4
Press =

Screen Output: 1

2. Fraction Reduction

Simplifying Fractions (`Simp` & `Fac`)

Reduce fractions step-by-step and inspect the common factor used during simplification.

Problem: Simplify $\frac812$

Press 8 → Press n/d → Press 12
Press Simp
(Optional) Press Fac to view the divisor factor.

Screen Output: 2/3 | Factor = 4

3. Mixed Numbers

Improper to Mixed Conversion (`U n/d`)

Convert improper fractions into whole numbers with fractional parts.

Problem: Convert $\frac73$ to a mixed number

Press 7 → Press n/d → Press 3
Press U n/d

Screen Output: 2 U 1/3

4. Integer Division

Division with Remainder (`Int÷`)

Get whole number quotients and explicit remainders instead of standard decimals.

Problem: Calculate $14 \div 3$ with remainder

Press 14
Press Int÷
Press 3 → Press =

Screen Output: 4 r 2

5. Decimal Precision

Decimal Place Rounding (`Fix`)

Set fixed decimal places (tenths, hundredths, thousandths) for precise answer rounding.

Problem: Round $12.3456$ to 2 decimal places (Hundredths)

Press 12.3456
Press Fix
Press 2 → Press =

Screen Output: 12.35 (Fix indicator active)

6. Mode Settings

Simplification Mode Switch (`Auto/Man`)

Toggle between Automatic fraction reduction and Manual student step-by-step factor entry.

Problem: Switch from Auto to Manual fraction reduction

Press Auto/Man key once
Screen toggles mode between AUTO and MAN
In MAN mode, enter a factor (e.g., 2) before pressing Simp

Mode Active: MAN Simp (Step-by-step reduction)

TI-15 Function Quick Reference Sheet

Goal / Action	Keypress Sequence Example	Screen Result
Enter Stacked Fraction	`2` → `n/d` → `5`	`2/5`
Simplify Fraction	`6` → `n/d` → `9` → `Simp`	`2/3`
View Common Factor	Press `Fac` after simplifying	`Factor = 3`
Convert Improper to Mixed	`5` → `n/d` → `2` → `U n/d`	`2 U 1/2`
Division with Remainder	`17` → `Int÷` → `5` → `=`	`3 r 2`
Round to 2 Decimals	`3.1415` → `Fix` → `2`	`3.14`
Toggle Auto / Manual Mode	Press `Auto/Man`	`Mode: AUTO / MAN`