CKMath Unit 1: Introducing Multiplication
Focus:
In this unit, students interpret and represent data on scaled picture graphs and scaled bar graphs. Then, they learn the concept of multiplication. Students explore scaled picture graphs and bar graphs as an entry point for learning about equal-size groups and multiplication. The idea that one picture can represent multiple objects helps to introduce the idea of equal-size groups. Students learn that multiplication can mean finding the total number of objects in groups of objects each, and can be represented by a x b. They then relate the idea of equal groups and the expression a x b to the rows and columns of an array. In working with arrays, students begin to notice the commutative property of multiplication. In all cases, students make sense of the meaning of multiplication expressions before finding their value, and before writing equations that relate two factors and a product. Later in the unit, students see situations in which the total number of objects is known but either the number of groups or the size of each group is not known. Problems with a missing factor offer students a preview to division.
Number of Lessons: 20 and 1 optional
Instruction Time:
Approximately 60 minutes
(Please note that each lesson is designed for one instructional block, and may be divided into shorter or longer segments based on teacher pacing and student needs.)
