Clip 3/11: Adding and Subtracting with Money Lesson Part 1B

As she continues her lesson on adding multiple two-digit numbers, Katy presents her 2nd-grade students with a “big challenge … you are going to get to go shopping for other children today.” She describes the problem scenario, in which students will work with a partner, receiving “$300 to spend on toys that will be donated to a charity … so you’re going to have to determine and figure out what combination of toys can you buy with your $300.” She divides her students into groups and circulates among the groups, probing their thinking as they work. Her students debate their choices and correct each other when their total exceeds $300. The partners evaluate their process as they go. (“What else can we add to this? We’re going to need something else to add to it to see if we can make it.”)