Fluently add and subtract within 100 using strategies mentally, to 20 and combinations of 100. based on place value, properties of operations, and/or M.P. 1 Number line, Students need to master the the relationship between addition and subtraction. M.P. 3 About, terms sum and difference, and Add up to four two-digit numbers using strategies based M.P. 4 Round, finalize their understanding of on place value and properties of operations. M.P. 6 Nearest ten, breaking up numbers Add and subtract within 1000, using concrete models or Estimate, (decomposing) doing the drawings and strategies based on place value, Reasonable operations and adding or properties of operations, and/or the relationship between subtracting to compensate. addition and subtraction; relate the strategy to a written The number line can be a great method. Understand that in adding or subtracting tool to show students how numbers, one adds or subtracts hundreds and close a number and relate this hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose to rounding. tens or hundreds. 59 + 35 can be done with 60 + 35 – 1. 220 + 48 can be done Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number with 220 + 48 (220 + 40 + 8). 715 + 160 can be done thinking 800 + 75 (60 + 15). Explain why addition and subtraction strategies work, using place value and the properties of operations.1 When the students are subtracting 10, help them see Explanations may be supported by drawings or they may have taken away too objects. much and have to add the Represent and solve problems involving remaining part of the number addition and subtraction. back. Use addition and subtraction within 100 to solve one- Tools to help are the number and two-step word problems involving situations of line and bar models. 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.
M.P. 1 M.P. 3 M.P. 4 M.P. 6 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Add up to four two-digit numbers using strategies based on place value and properties of operations. Add and subtract within 1000, 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. Understand that in adding or subtracting numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds. Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number Explain why addition and subtraction strategies work, using place value and the properties of operations.1 Explanations may be supported by drawings or objects. Represent and solve problems involving addition and subtraction. 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. mentally, Number line, About, Round, Nearest ten, Estimate, Reasonable to 20 and combinations of 100. Students need to master the terms sum and difference, and finalize their understanding of breaking up numbers (decomposing) doing the operations and adding or subtracting to compensate. The number line can be a great tool to show students how close a number and relate this to rounding. 59 + 35 can be done with 60 + 35 – 1. 220 + 48 can be done with 220 + 48 (220 + 40 + 8). 715 + 160 can be done thinking 800 + 75 (60 + 15). When the students are subtracting 10, help them see they may have taken away too much and have to add the remaining part of the number back. Tools to help are the number line and bar models.
grade_2_curriculum_math_in_focus.docx