Module 4 marks the next exciting step in math for kindergarteners, addition and subtraction! They begin to harness their practiced counting abilities, knowledge of the value of numbers, and work with embedded numbers to reason about and solve addition and subtraction expressions and equations. In Topics A and B, decomposition and composition are taught simultaneously using the number bond model so that students begin to understand the relationship between parts and wholes before moving into formal work with addition and subtraction in the rest of the module.
FOCUS AREA - TOPIC A
In Lesson 1 and 2, students will be shown a group of pictures: two cats and 3 dogs.
They will have to understand that here are 5 animals: 2 are cats and 3 are dogs.
They will decompose the number 5 as 5 in 2 and 3.
They will also compose the number 5. 2 cats and 3 dogs make 5 animals.
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In Lesson 3, students will begin to write numbers in the place of pictures when creating a number bond.
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In Lesson 4, students will begin to consider decomposing as a whole separated into number parts.
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In Lesson 5 and 6, students will explore the concept that number bonds can be used to add and subtract. They will also begin to create stories to match their number bonds.