Understanding Converting Mixed Numbers & Improper Fractions
The TI-15 Explorer isn't just a number cruncher — it's built specifically to help younger students actually see how math works, rather than just handing them an answer. Switching between improper fractions and mixed numbers is a great example of that: the calculator shows the conversion happening rather than just displaying a final result.
Here's the thing to remember: because the TI-15 has function keys built just for this, kids can watch the math happen step by step instead of treating the calculator like a black box.
How to Convert Between Forms, Step by Step
- Switch it on. Hit the On/Clear key to get started.
- Enter your fraction. Use the n/d key to input the numerator and denominator of your improper fraction.
- Press U n/d. This is the key that converts an improper fraction into a mixed number (or back again).
- Read the result. The screen will display the whole number and remaining fraction — for example, 2 U 1/3.
The Keys You'll Actually Use
n/d— Splits an entry into numerator and denominator, which is how you enter a fraction in the first place.U n/d— The conversion key itself. Press it to switch an improper fraction (like 7/3) into a mixed number (2 U 1/3), or vice versa.Simp— Not the focus here, but useful to combine with this: simplify a fraction before or after converting it, either automatically or manually.
Common Questions
How do I wipe the calculator's memory?
Just tap Clear twice in a row. If that doesn't do it, there's a physical Reset button on the back.
Does the TI-15 simplify fractions on its own?
It can, yes — but it doesn't have to. You can flip between Auto mode (where it reduces automatically) and Manual mode (where you pick the divisor yourself) right from the settings.