Grade 2: whole number computation

the great dogsled race

Lesson has been adapted from Mathology - To access all of these resources in both English and French, login to your Mathology account

On a computer? Click "file" then "make a copy" to save and make changes.

On an iPad? Select the 3 dots in the top right hand corner. "Share and Export" then "Make a Copy".

Content

Big Ideas:


  1. Quantities and numbers can be added and subtracted to determine how many or how much.

  2. Use of known sums and differences to solve other equations (e.g., using 5 + 5 to add 5 + 6).

  3. Each successive number is one more than the previous number (i.e., hierarchical inclusion).


Expectations:

  • B1. Number Sense: demonstrate an understanding of numbers and make connections to the way numbers are used in everyday life

  • • Whole Numbers: B1.1 read, represent, compose, and decompose whole numbers up to and including 200, using a variety of tools and strategies, and describe various ways they are used in everyday life

  • • Whole Numbers: B1.2 compare and order whole numbers up to and including 200, in various contexts

  • B2. Operations: use knowledge of numbers and operations to solve mathematical problems encountered in everyday life

  • • Properties and Relationships: B2.1 use the properties of addition and subtraction, and the relationships between addition and multiplication and between subtraction and division, to solve problems and check calculations

  • • Math Facts: B2.2 recall and demonstrate addition facts for numbers up to 20, and related subtraction facts

  • • Mental Math: B2.3 use mental math strategies, including estimation, to add and subtract whole numbers that add up to no more than 50, and explain the strategies used

  • • Addition and Subtraction: B2.4 use objects, diagrams, and equations to represent, describe, and solve situations involving addition and subtraction of whole numbers that add up to no more than 100


Learning Goals

Students will...

  • estimate sums and differences

  • model and symbolize addition and subtraction

  • compare and order quantities to 100

  • apply the strategies of using friendly numbers and developing mental math




Success Criteria

I can…

Add and Subtract to 100

  • Estimate sums and differences

  • Extend known sums and differences to solve other equations

  • Develop mental and personal addition and subtraction strategies

  • Model and symbolize addition and subtraction

Compare and Order Numbers

  • Compare and order quantities to 100

  • Order three or more quantities

  • Find how many more/less one quantity is compared to another


Materials

  • Access to “Mathology” website- every educator from K-3 has access. Contact Erica Doucet, Kerry Crocker or Haley Brooks if you require your login credentials.

Pedagogy

Number Talk Resources

Fosnot “Minilessons for Early Addition and Subtraction” / “Mini Lessons for Extending Addition and Subtraction”

Minds On

To access the digital book, login to “Matholgy ”.If you require your login credentials, contact Erica Doucet, Kerry Stack, or Haley Brooks

Whether you are working with a large group, a small group, or an individual child, the first step is to simply enjoy the story.

To introduce The Great Dogsled Race, read the title and discuss the cover. You might ask:

Have you ever been dogsledding? If so, how would you describe it? What do you know about dogsled races?

  • What do you think might happen in this book? Where do you think it might take place? Why?


If reading with a small group, invite them to flip through their books and choose a picture that gives them a clue about where the race takes place. If reading with a large group, project a page or spread and invite children to explain where they think the race takes place. Once a page is selected, say

  • Take a close look at this photograph. What do you notice about the setting?

Bring out, or project, a map of Canada and focus on Nunavut. Explain that the dogsled race takes place in Kivalliq, a region in Nunavut that borders Hudson Bay. Ask children to describe the setting. You may wish to share with children that, though there are dogsled races in Nunavut, the race in this book is fictional. Read the book aloud, encouraging children to ask questions and make connections with what they know about Canada’s North.

Action!

In partners have students complete the “Race Map” assignment. Race Map in French

Students will determine their own checkpoints and the distances between them.

Consolidation Ideas

As a class, discuss student findings and strategies from the “Race Map” assignment. What were the furthest distances? Shortest distances? Complete a gallery walk of the open number lines they created for the race map.

Independent Task / Assessment Opportunities

Have students complete the Dog sled Math problems independently.

SEL Student Self-Assessment FRENCH / ENGLISH SEL Teacher Rubric

Technology