Explain the size of measurements to your child by comparing them to objects they can visualize. For example, one inch is a bottle cap and one foot is the size of a hammer. Then, explain that one yard is the width of a door. Then, go through worksheets, circling the best estimates for each object's length.
This worksheet will help your child learn how to read a ruler using both centimeters and inches. It's an important skill that will benefit them throughout life! With practice, they'll gain a better understanding of these basic units of measurement.