A child computes how many are missing from a larger group.
Focus on the Child videos are taken from one-on-one interviews with individual children. The interviews are designed to elicit evidence of children’s mathematical thinking. They are not teaching episodes or formal assessments.
Sets can be compared using the attribute of numerosity, and ordered by more than, less than, and equal to. More
Sets can be changed by adding items (joining) or by taking some away (separating). More
Common Core Alignment
Counting and Cardinality More