Multiply by 5
Multiply by 5 by halving, then adding a zero.
48 × 5 = 240
5 is half of 10, so take half of 48 first, then ten of that.
Halve: 48 ÷ 2 = 24. Then shift a place: 24 × 10 = 240.
Your turn
Three to try in your head — tap what you get.
34 × 5
49 × 5
83 × 5
All 36 shortcuts: the Magic Tricks library.