25 × 6 = 150; 50 × 3 = 150

17 × 9 = 153; 34 × 4½ = 153

π × the square root of 2 = 4.442882938...; 2π × half of the square root of 2 = 4.442882938...

*i* × 36 = 36*i*; 2*i* × 18 = 36*i*

(7 + 8*i*)(9 + *i*) = 55 + 79*i*; (3½ + 4*i*)(18 + 2*i*) = 55 + 79*i*

(This time, I cut the 1st factor in half & doubled the 2nd one!)

1 × 3 = 3; 2 × 1½ = 3; ½ × 6 = 3

0 × 9 = 0; 0 × 18 = 0; 0 × 4½ = 0

Back to Index Page Back to Math Trick Menu

© Derek Cumberbatch