Grade 3 - Tier 2
Addition and Subtraction
(small group instruction on this topic should occur at least 6 weeks after Tier 1 instruction)
Embedded Files
Curriculum Expectations
Curriculum Expectations
B2.1 use the properties of operations, and the relationships between multiplication and division, to solve problems and check calculations
B2.3 use mental math strategies, including estimation, to add and subtract whole numbers that add up to no more than 1000, and explain the strategies used
B2.4 demonstrate an understanding of algorithms for adding and subtracting whole numbers by making connections to and describing the way other tools and strategies are used to add and subtract
B2.5 represent and solve problems involving the addition and subtraction of whole numbers that add up to no more than 1000, using various tools and algorithms
Watch this video to learn how to adminster & assess Entry Check-In.
Watch this video to learn how to adminster & assess Entry Check-In.
Watch this video to learn how to effectively use the Tracking Sheet & access the Problem Sets.
Watch this video to learn how to effectively use the Tracking Sheet & access the Problem Sets.
Things to Note
Things to Note
Fluency with addition and subtraction follows a developmental progression
(see Slides 2-5 of each problem set to review this progression).For more information about Foundational Facts and Derived Facts, please read the National Council of Teaching of Mathematics (NCTM) article called
"The Five Fundamentals".For more information about Strategies, please refer to the Ontario Ministry of Education's "Strategies for Mental Math" document and various resources that can be found in your school (e.g., What to Look For by Lawson, Minilessons by Fosnot, and Teaching Developmentally by Van De Walle).
Important Tools & Representations
Important Tools & Representations
Tools/Manipulatives: counters, rekenreks, base ten materials, relational rods, etc.
Representations/Models: ten frames, number path or number line, etc.
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