Measure Length with Inch Cubes
š§ Build a ruler! We can use little cubes that are exactly 1-inch long to measure anything. Just line them up end-to-end!
Concept
Before humans invented standardized wooden rulers, they used small objects to measure things. We can use "Inch Cubes" (blocks that are exactly 1 inch wide on all sides)! šÆ **The Measuring Rules:** To measure a toy car with cubes: 1. **Start perfectly at the edge:** The first cube MUST start perfectly aligned with the front bumper of the car. No hanging off the edge! 2. **End-to-end:** The cubes must touch each other perfectly. No giant gaps! No overlapping onto each other! 3. **Count the cubes:** 1, 2, 3, 4, 5. The car is 5 cubes long! Because each cube is 1-inch long... the car is 5 inches long!
Try it
Line up the cubes! **Instructions:** Look at the picture (or imagine it) and count the perfectly lined up cubes. **Problem 1:** A picture of a pencil has perfectly connected inch-cubes lined up beneath it. There are 6 cubes. * How long is the pencil? ___ inches. **Problem 2:** You want to measure a book. You line up 9 inch-cubes, but there is a big gap between cube 4 and 5. * Is this a correct measurement? (Yes / No) **Problem 3:** A toy lizard is exactly the same length as a train of 12 inch-cubes. * How long is the lizard? ___ inches. **Problem 4:** You measure a leaf with cubes. The first cube starts exactly at the stem, and the 4th cube ends exactly at the tip. * Length: ___