This resource is part of a 3 lesson module. Topic C lesson 6-8. This resource includes the overview, lesson plans and activities. The resource is from EngageNY and licensed through Creative Commons. http://creativecommons.org/licenses/by-nc-sa/3.0/us. Aligned with 2.OA.1, 2.NBT.5, 2.OA.2, 1.NBT.4, 1.NBT.5, 1.NBT.6
Strategies for Addition and Subtraction Within 100
Subject
Math — Operations and Algebraic Thinking
Grade Level
Grades K-2
Resource Type
Lesson Plan
Standards Alignment
Common Core State Standards
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Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
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