Beacon Lesson Plan Library
Santa Rosa District Schools
Students show understanding of the relationship of multiplication and addition by writing multiplication number sentences.
The student understands and explains the effects of addition, subtraction, and multiplication on whole numbers, decimals, and fractions, including mixed numbers, and the effects of division on whole numbers, including the inverse relationship of multiplication and division.
-Egg cartons (an extra one with cups cut out and replaced with a clear wrap for overhead projector)
1. Prepare a worksheet for the students. Make copies.
EX: 1. Count out six beans into each egg cup. How many beans are there in 4 cups? (6 x 4=_____) Check by skip counting and adding. (6 + 6 + 6 + 6=____)
2. Cut the bottom cups off of an egg carton and cover the open hole with clear wrap for demonstrating with overhead transparency. Tape the clear wrap to the bottom of each egg cup.
3. Fill the plastic containers with dried beans or small chips.
1. Using an overhead projector, demonstrate how equal sets in each egg cup can be multiplied in two ways, then write number sentences for both ways.
This is also a good time to show the relationship of addition and multiplication.
ex: Count out four beans into the cups, then count the beans by fours in three cups. Three cups (sets) with four beans in each cup (set).
(i.e. 3 x 4=12 & 4 + 4 + 4 =12)
Next, count three beans in four cups (sets). Four cups (sets) with three beans in each cup (set).
(i.e. 4 x 3=12 & 3 + 3 + 3 + 3 = 12)
They may skip count and add to check.
2. Give each pair of students one egg carton, one plastic container with beans, one worksheet with multiplication problems and directions for solving multiplication problems with beans in a cup. Pairs of students check problems by skip counting and adding.
For formative assessment, the teacher observes pairs of students using beans to explain the effects of addition and multiplication while solving multiplication problems correctly. The teacher also observes pairs of students checking their work using repeated addition.