Video narration
What if you measure this strip with part of a unit? Divide the same strip into two equal pieces: one is 1/2, one of two. Divide it into four, one is 1/4; into eight, one is 1/8. As equal pieces increase, each gets smaller. But each piece can do more than show a part: it can measure. Four 1/4 pieces make one whole. Three one-fourth pieces measure three-fourths of that strip.