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Science & Math flashcards
Fractions, Decimals, and Percents
Fractions, decimals, and percents flashcards for common conversions and mental math.
#math#fractions#decimals#percents
About this deck
This fractions, decimals, and percents deck reviews common conversions and quick percent problems. It is useful for school math, placement tests, and everyday mental math.
The cards emphasize high-frequency equivalents such as halves, thirds, quarters, fifths, eighths, tenths, and simple percentage calculations.
46cards
Middle school mathlevel
middle school math students, teachers, parents, and test prep learnersaudience
What you will learn
- Common fraction-decimal-percent equivalents.
- Fast percent-of-a-number calculations.
- How to move between decimal, fraction, and percent forms.
- Mental math patterns that appear in quizzes and real life.
How to study this deck
- Memorize benchmark conversions first: 1/2, 1/4, 3/4, 1/5, and 1/8.
- Write the three forms together so the relationships become automatic.
- Practice percent questions without a calculator, then check the card.
Scope
This deck focuses on common conversions and mental math prompts. It does not cover full fraction operations or algebraic percent equations.
Review notes
Conversion list last reviewed for public SEO pages on 2026-07-06.
All 46 cards in this deck
| Front | Back |
|---|---|
| 1/2 | 0.5 = 50% |
| 1/3 | 0.333... = 33.333...% |
| 2/3 | 0.666... = 66.666...% |
| 1/4 | 0.25 = 25% |
| 3/4 | 0.75 = 75% |
| 1/5 | 0.2 = 20% |
| 2/5 | 0.4 = 40% |
| 3/5 | 0.6 = 60% |
| 4/5 | 0.8 = 80% |
| 1/6 | 0.1666... = 16.666...% |
| 5/6 | 0.8333... = 83.333...% |
| 1/8 | 0.125 = 12.5% |
| 3/8 | 0.375 = 37.5% |
| 5/8 | 0.625 = 62.5% |
| 7/8 | 0.875 = 87.5% |
| 1/10 | 0.1 = 10% |
| 3/10 | 0.3 = 30% |
| 7/10 | 0.7 = 70% |
| 1/20 | 0.05 = 5% |
| 1/25 | 0.04 = 4% |
| 1/50 | 0.02 = 2% |
| 1/100 | 0.01 = 1% |
| 0.125 | 1/8 = 12.5% |
| 0.2 | 1/5 = 20% |
| 0.25 | 1/4 = 25% |
| 0.375 | 3/8 = 37.5% |
| 0.5 | 1/2 = 50% |
| 0.625 | 5/8 = 62.5% |
| 0.75 | 3/4 = 75% |
| 0.875 | 7/8 = 87.5% |
| 10% of 250 | 25 |
| 20% of 150 | 30 |
| 25% of 80 | 20 |
| 30% of 90 | 27 |
| 40% of 75 | 30 |
| 50% of 64 | 32 |
| 60% of 45 | 27 |
| 75% of 120 | 90 |
| 12.5% of 96 | 12 |
| A number increases from 40 to 50 | 25% increase |
| A number decreases from 80 to 60 | 25% decrease |
| Convert percent to decimal | Divide by 100 |
| Convert decimal to percent | Multiply by 100 |
| Convert fraction to decimal | Divide numerator by denominator |
| Equivalent to 150% | 1.5 = 3/2 |
| Equivalent to 200% | 2 = 2/1 |
Frequently asked questions
What conversions are in this deck?
It includes common fractions, decimals, and percents plus quick percent-of-a-number prompts.
Is this for elementary or middle school math?
It is most useful for upper elementary and middle school learners, but it also helps adults refresh mental math.
Does it teach how to convert fractions?
The cards include conversion facts and reminders. For deeper instruction, pair them with worked examples.
Is the Fractions, Decimals, and Percents flashcard deck free?
Yes. You can study it free in your browser on MazoCards. Create a free account to save progress, track streaks, and sync across devices.
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