Length of Unit: 5 Days
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Students will explore the subtraction concept of removal.
The purpose of the Day 2 activities is to reinforce key concepts from Day 1. Students will engage in a string of related problems through a math talk and will have an opportunity to complete independent purposeful practice. The math talk and purposeful practice serve to develop a deeper understanding of the following big ideas.
- Part-whole relations: Relationships between addition & subtraction.
- One-to-one correspondence.
- One structure of subtraction is “removal”.
In order to encourage strategy of keeping one number whole and taking jumps back of ten and adding one more/one less, engage students in the following math talk. Consider modelling student thinking using a concrete number line with benchmark numbers identified.
20 – 10
21 – 10
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