How to Type Fractions in DeltaMath
Quick Answer
Use a forward slash (/) between numerator and denominator: type 3/4 and DeltaMath automatically renders it as a stacked fraction. For mixed numbers, add exactly one space between the whole number and fraction: 2 1/4. For negative fractions, place the minus sign before the numerator: -3/4. The most common mistake is using a backslash (\) instead of forward slash (/), or forgetting the space in mixed numbers.
On This Page
The Basic Method: Forward Slash
DeltaMath’s fraction system is built around a single rule: forward slash (/) between numerator and denominator. Type the top number, type /, type the bottom number. The platform converts your input into proper stacked fraction notation automatically.
✓ Correct
3/4
Forward slash — renders as stacked ¾
✕ Wrong
3\4
Backslash — won’t format, answer rejected
Where is the forward slash? On a standard keyboard it shares a key with the question mark (?), to the right of the period and left of the right Shift key. Press it without Shift. The backslash (\) is a different key entirely — usually above Enter. Don’t confuse the two.
After typing your fraction, check how DeltaMath renders it before clicking Submit. If it shows plain text like 3/4 rather than a stacked fraction, something went wrong — most likely a backslash or extra space. Fix it before submitting or you’ll waste an attempt on a problem you solved correctly.
All Fraction Types with Examples
Proper and Improper Fractions
Both use identical formatting — same forward slash rule regardless of whether the numerator is smaller or larger than the denominator.
| What you want | Type this | DeltaMath renders |
|---|---|---|
| Three-quarters | 3/4 | ¾ (stacked) |
| Seven-sixteenths | 7/16 | 7/16 (stacked) |
| Five-halves (improper) | 5/2 | 5/2 (stacked) |
| Eleven-thirds (improper) | 11/3 | 11/3 (stacked) |
Mixed Numbers
Mixed numbers require exactly one space between the whole number and the fraction. This is the single most common mistake on DeltaMath fraction problems.
✓ Correct — one space
2 1/4
Renders as 2¼
✕ Wrong — no space
21/4
Reads as 21/4 = 5.25, not 2.25
Without the space, DeltaMath reads 21/4 as the improper fraction twenty-one fourths (5.25) — completely different from two and one-quarter (2.25). Always press spacebar once between the whole number and the fraction.
Negative Fractions and Negative Mixed Numbers
Place the minus sign before the numerator for negative fractions, and before the whole number for negative mixed numbers. Do not put the minus sign in the denominator.
| What you want | Type this | Note |
|---|---|---|
| Negative three-quarters | -3/4 | Minus before numerator ✓ |
| Negative five-eighths | -5/8 | Minus before numerator ✓ |
| Negative two and one-third | -2 1/3 | Minus before whole number ✓ |
| Avoid: minus in denominator | 3/-4 | Non-standard — may be rejected ✕ |
Fractions with Variables (Algebra)
Variable fractions use the same forward slash. The critical rule: use parentheses whenever the numerator or denominator contains more than one term. Without parentheses, DeltaMath applies order of operations literally and your expression means something different than you intend.
✓ Correct
(x+1)/(x-2)
Renders as (x+1) over (x−2)
✕ Wrong
x+1/x-2
DeltaMath reads as x + (1/x) − 2
Simple variable fractions with a single term need no parentheses: x/y or 2x/3 work fine as-is.
Fraction Input Reference Card
Keep this as a quick reference while working on DeltaMath assignments. The orange left border indicates rules that cause the most student errors.
Orange left border = most common error type. Green text = what to type in DeltaMath’s answer box.
Common Mistakes
Backslash instead of forward slash
Typing 3\4 instead of 3/4. The backslash (\) is above Enter. The forward slash (/) is next to the right Shift key. They look similar when you’re moving fast. This produces plain text that DeltaMath won’t format, and the answer is rejected.
Missing space in mixed numbers
21/4 is not 2¼ — it’s the fraction 21 over 4, which equals 5.25. The problem you solved correctly gets marked wrong because DeltaMath can’t distinguish your intent. Always press spacebar once between the whole number and the fraction.
Not simplifying
Entering 6/8 when DeltaMath expects 3/4. Mathematically equivalent, but DeltaMath’s automated grader marks it wrong. Simplify every fraction before entering it.
Spaces around the slash
3 / 4 may not format correctly. Type numerator, slash, denominator with no spaces between them: 3/4. The only space anywhere in a fraction is the one between the whole number and fraction in a mixed number.
Missing parentheses in algebraic fractions
Without parentheses, x+1/x-2 reads as x plus (1/x) minus 2, not the fraction you mean. For any multi-term expression in the numerator or denominator, wrap it: (x+1)/(x-2).
Wrong format: decimal instead of fraction
Entering 0.75 when the problem expects 3/4. DeltaMath’s grader does not convert between equivalent forms. If the answer box is set up for a fraction, enter a fraction.
Wrong format: mixed number vs. improper fraction
Some problems specifically require an improper fraction; others require a mixed number. Read the problem instructions. 5/2 and 2 1/2 are the same value but DeltaMath may accept only one depending on assignment settings.
Typing Fractions on Mobile
The same forward slash rules apply on mobile. The challenge is finding the / key, since it’s not on the default letter keyboard.
iOS (iPhone / iPad): Tap the answer box, then tap 123 in the bottom-left corner to switch to the numbers keyboard. The forward slash (/) appears in the bottom row. Type numerator, tap /, type denominator.
Android: Tap the answer box, then tap ?123 or the symbols key to access the numbers/symbols keyboard. Forward slash is typically visible immediately. Some keyboards require a second tap (=\< or similar) for additional symbols.
Tips for mobile: Rotate to landscape orientation for a larger keyboard. Check the rendering after typing — mobile browsers sometimes delay converting the fraction to stacked notation. If DeltaMath is behaving strangely on mobile, switch to Chrome or Safari rather than an in-app browser (Facebook, Instagram, etc. have browser issues with educational platforms).
If mobile keeps giving you trouble: Complete the assignment on a computer where the forward slash key is easy to find. Small phone keyboards make typos significantly more likely on math platforms, and that cost you points on problems you actually solved right.
When DeltaMath Requires Simplification
DeltaMath almost always requires fractions in lowest terms. The default assumption is: simplify. If you enter 6/8 and the expected answer is 3/4, it will be marked wrong even though they’re equal.
How to simplify quickly: Find the greatest common factor (GCF) of the numerator and denominator, then divide both by it. For 6/8: GCF of 6 and 8 is 2, so (6÷2)/(8÷2) = 3/4. For 10/15: GCF is 5, so (10÷5)/(15÷5) = 2/3.
The only exceptions are when the problem explicitly says “do not simplify,” asks for “an equivalent fraction with denominator X,” or is specifically testing unsimplified forms. When in doubt, simplify — a properly simplified fraction is never wrong due to form.
Mixed number vs. improper fraction: Algebra problems typically expect improper fractions (easier to use in equations). Arithmetic problems typically expect mixed numbers (more natural). Follow whatever format the problem models in its examples.
Troubleshooting
Fraction shows as plain text, won’t format
Check for backslash first. Then: clear cache and refresh, verify JavaScript is enabled, try a different browser (Chrome, Firefox, Safari, Edge are best), disable ad blockers temporarily.
Fraction formats correctly but marked wrong
Check simplification first. Then check whether the problem wants improper fraction vs. mixed number. Reread the problem to make sure you didn’t calculate correctly but in the wrong form. Double-check arithmetic.
Mixed number won’t display correctly
Verify exactly one space between whole number and fraction. Delete and retype carefully. If the problem requires an improper fraction, convert: 2 1/4 → (2×4+1)/4 → 9/4.
Persistent issues despite correct input
Try a different device or browser. Screenshot your work and the wrong-mark result, then contact your teacher. Most teachers will review manually when you can show the mathematics was correct. DeltaMath teachers have a dashboard that lets them see your attempts.
Stuck on DeltaMath algebra or pre-calc?
Formatting is one thing — but if the math itself is the problem, FMMC handles DeltaMath assignments for algebra and pre-calculus with an A/B grade guarantee. Read what students say or reach out directly.