Multiply by 25
Multiply by 25 by quartering, then adding two zeros.
32 × 25 = 800
Four 25s make 100, so bundle the 32 into groups of four.
Quarter by halving twice: . Then 8 × 100 = 800.
Your turn
Three to try in your head — tap what you get.
92 × 25
64 × 25
80 × 25
All 36 shortcuts: the Magic Tricks library.