Maths Shortcuts Memory Tricks

8 tricks

Compound Interest Shortcut Method

The 'Net Effect' Method: For 2 years at r%, effective rate =...

The Anchor Method: Start from the nearest 'easy' percentage....

D-D-R-S-C: Difference → Double Difference → Ratio → Squares ...

Successive Discounts of a% and b%: Net discount = a + b − ab...

LCM Method: Take LCM of days as Total Work units. Each perso...

Alligation Cross: Draw an X. Put cheaper on top-left, dearer...

Approximation strategy: Replace ugly numbers with nearby rou...

FRACTION TABLE: Memorize these — they eliminate 80% of DI ca...