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Measure length with formal units, using metric centimeters and customary inches, to the nearest quarter inch. Learn the convention of measuring from zero. Transition to measuring from any number by calculating the distance between the starting and ending points. Move on to breaking units into halfs and fourths to measure more precisely.
Use a ruler to measure the length of a colored bar. Start by measuring from zero. Transition to measuring from any number by calculating the distance between the starting and ending points on the ruler. Use reasoning and arithmetic to compare and calculate how much longer or shorter one bar is than another.
Prerequisites: 2-110 ○ 1-125
Generalize from measuring in inches to measuring in smaller, centimeters. "Cent" means 100, and 100 centimeters makes 1 meter. Measure from zero or any point on the ruler by calculating the distance between the starting and ending points. Compare and calculate how much longer or shorter one bar is than another.
Prerequisites: 2-113
Use rulers to measure and compare colored bars. Find the difference between 2 bars by adding and subtracting in inches or centimeters. Align bars with zero, then transition to calculating length as the distance between any 2 points. Use rulers like a number line.
Prerequisites: 2-114
