We learned about length and height. Length tells how long something is. Height tells how tall something is. You can use paper clips to tell how long a pencil is or anything else. Use cubes to measure how tall a paper is or anything else. Length and height are similar because you can measure them both with a ruler or yardstick. It is important to know how to measure because you would need to know how widw or tall something is so you can fit it in a certain place.