Reflection: Checks for Understanding Adding and Subtracting Decimals with Card Sort Activity - Section 2: Card Sort Group Activity

As I circulated throughout the groups, I noticed that some students were more easily able to interpret Base-10 denominators as representing decimals than and other students.  For example, when students worked on Card 14, some students immediately understood that each fraction's denominator indicated its place value. Importantly, I observed other students working on this card by adding the fractions together using a common denominator. Both methods are correct, of course, but the presence of the different methods provided a good opportunity to see how my students were making the connection between fractions and decimals. And, it allowed me to give students the opportunity to explain their strategies to each other. Recognizing the structure of the number in the denominators appears to be a shortcut, but it also shows good conceptual understanding.

Checks for Understanding: Different Understandings & Different Strategies

Adding and Subtracting Decimals with Card Sort Activity

Unit 8: Algorithms and Decimal Operations
Lesson 1 of 10

Big Idea: What do fractions have to do with decimals?!

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Subject(s):
Math, Fractions, Decimals, activity
50 minutes

Ursula Lovings

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