How to use it
- Multiply by 100.
- Divide by 4, often by halving twice.
See it in action
48 × 25 = 4800 ÷ 4 = 1200.
How to verify it
Check: 25×4=100, so 48 groups of 25 make 12 hundreds.
Multiply by 25 Fast
Because 25 is one quarter of 100, multiply by 100 and divide by 4.