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Student Instructions
1. Take a close look at the collection and estimate how many marbles there are.
2. Use the 
to write your estimate
3. Use the 
tool to move and group the marbles to make them easier to count.
4. Use the to write the actual number of marbles.
5. Use the 
to record how you estimated and counted.
6. Submit your work by clicking 
.
1. Observa de cerca la colección y calcula cuántas canicas hay.
2. Utiliza para escribir tu estimación
3. Utiliza la herramienta para mover y agrupar las canicas para que sea más fácil contarlos.
4. Utiliza el para escribir el número real de canicas.
5. Utiliza: mic: para explicar cómo estimó y contó.
6. Entrega tu trabajo oprimiendo la palomita verde.
Teacher Notes (not visible to students)
Big Idea Estimation allows students to reflect on the accuracy of their own solutions. It provides a perspective for critiquing the chosen strategies and outcomes when solving problems. Objective use models to estimate an answer when adding 2, two-digit numbers.
