For your child to fully understand the meaning of each unit of measurement, you must be ready to present them with objects they can visualize. Show them a bottle cap and explain that an inch is roughly that size. Next, grab a hammer and explain how the size of a hammer is about 1 foot. Finally, show them how 1 yard is about the width of a door. Next, look through the worksheet and circle all the best estimates for the length of each object.