GUMMY WORMS [DAY 2]

SUBTRACTION

Uncover the various subtraction structures including removal, conparison, missing, addend, and missing subtrahend.

Intentionality

Math Talk

Purposeful Practice

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Intentionality & Unit Overview

Length of Unit: 5 Days

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DAY 1
DAY 2
DAY 3
DAY 4
DAY 5

Students will explore the subtraction concept of removal.

Intentionality…

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”.

Math Talk

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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Purposeful Practice

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Printable Consolidation Prompts

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