FRACTION TABLE: Memorize these — they eliminate 80% of DI calculations: 1/2=50%, 1/3=33.3%, 1/4=25%, 1/5=20%, 1/6=16.67%, 1/7=14.28%, 1/8=12.5%
Data Interpretation Tricks
SBI POIBPS POSSC CGLCAT
Items to Memorize
- Percentage to fraction conversion (12.5% = 1/8, 33.3% = 1/3)
- Quick multiplication tricks (multiply by 25 = ÷4×100)
- Approximation method (round to nearest 5 or 10)
- Bar graph reading (differences and ratios)
- Pie chart angles (1% = 3.6°)
- Average calculation shortcuts
- Percentage change formula ((New-Old)/Old × 100)
- Ratio and proportion in tables
Mnemonic Tricks
How It Maps
| Cue | Maps To |
|---|---|
| 1/2 = 50% | Half — the baseline everyone knows |
| 1/3 = 33.3% | One-third — very common in banking DI |
| 1/4 = 25% | Quarter — just halve the half |
| 1/5 = 20% | One-fifth — divide by 5 = multiply by 2, shift decimal |
| 1/6 = 16.67% | One-sixth — half of one-third |
| 1/7 = 14.28% | One-seventh — the tricky one, memorize this |
| 1/8 = 12.5% | One-eighth — half of one-quarter |
Why It's Faster
DI questions in banking exams use these fractions constantly. Converting percentages to fractions makes mental math 5x faster than long division.
Frequently Asked Questions
Should I calculate exact values in DI?
Almost never in banking exams. Options are usually spaced far apart. Round to nearest 5 or 10 and approximate — it's faster and still gives the right answer.
How to handle large numbers quickly?
Cancel zeros first (if all numbers are in lakhs, work in lakhs). Use fractions instead of percentages. Estimate before calculating.