Divide a square into 3 equal parts and shade 2 of those parts. Make 6 copies of that square. Count the thirds. There are 12 thirds, or [ggfrac]12/3[/ggfrac]. [ggfrac]12/3[/ggfrac] = 4, so [ggfrac]2/3[/ggfrac] x 6 = 4.