Grade 1 - Composing and Decomposing Numbers Unit
The Composing and Decomposing Numbers Unit involves conceptualizing whole numbers in terms of parts which builds flexible thinking, number sense and the foundation for addition and subtraction. Questions to answer might include—
- How many different ways can you show ten in two parts?
- What if zero can be one of the parts?
- How will you know when you have found all the ways?
Math Concepts and Skills:
The student builds strategies for addition and subtraction in order to solve problems.
The student:
- composes 10 with two or more addends with/without objects.
Summative Assessment Task
Students determine all the different ways Diane can put seven dimes in two bowls.
Instructional Tasks/Formative Assessments
Students determine how many vases Anna needs so she can put different combinations of red and pink flowers in each vase.
Students determine all the ways 10 apples can be divided into two bowls.
Students determine how many ways Tony can put 10 dogs in two pens at the animal shelter.
Students determine all the different ways to put nine soccer balls and basketballs in a bag.