N3C3TNp22

Answer to Problem 22: Strategies may vary. Example: Alicia may know that 16 + 16 is 32 so she would know that 160 + 160 is 320. So to get 160 + 161 Alicia could just add 1 to get a total of 321.

Teacher Notes:

Having students discuss their solution strategies helps them solidify their understanding and see likeness and differences between their strategies and their classmates.’ Having students verbalize or write about their thinking gives the teacher a wealth of information regarding a student’s understanding about the concept and about number in general.