The purpose of this activity is for students to learn Stage 2 of the Estimate and Measure center. Students choose an object and a unit to measure the object. Students can choose from centimeters, inches, and feet. They estimate the length of the object and then measure to find the actual length to the nearest whole unit. In this activity, students also find the difference between their estimate and their measurement for extra practice.

• Display a row of the recording sheet with this information:
  • Object: notebook
  • Unit: centimeters
  • Estimate: 20 cm
  • Actual Measurement: 31 cm
• “¿Cómo podemos encontrar la diferencia?” // “How can we find the difference?” (We can add on to 20 until we get to 31. We can subtract 20 from 31.)

The purpose of this activity is for students to learn Stage 1 of the Target Measurements center. In this stage, students try to draw a line segment as close as possible to the length of the target measurement in whole inches or centimeters. They measure the line to the nearest whole unit and find the difference between the target measurement and the actual length to get a score. The student with the lower score after 8 rounds wins.

• “¿Alguien dibujó un segmento de recta que tuviera la misma longitud que su longitud objetivo? Si no, ¿qué tan cerca estuvieron?” // “Did anyone draw a line segment that was the same length as your target length? If not, how close did you get?”
• “Cuando trabajaron con su compañero, ¿cuál fue su estrategia para dibujar segmentos de recta tan cercanos como fuera posible de su longitud objetivo?” // “What was your strategy when working with your partner to draw line segments that were as close as possible to your target length?”