subtract. 182 + 18 Fluently add and subtract within 100 using strategies 190 based on place value, properties of operations, and/or 10 the relationship between addition and subtraction. 200 Add up to four two-digit numbers using strategies based on place value and properties of operations. Subtraction across zeros can be Add and subtract within 1000, using concrete models or done by decomposing the base drawings and strategies based on place value, ten number into 1 and 1 less than properties of operations, and/or the relationship between the number. For example, 200 – addition and subtraction; relate the strategy to a written 18. Decompose 200 into 199 + 1. method. Understand that in adding or subtracting Subtract the 18 from 199 and add numbers, one adds or subtracts hundreds and the one back on. hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds. Explain why addition and subtraction strategies work, using place value and the properties of operations.1 1 Explanations may be supported by drawings or objects. Module 4: Join Visuals: Relate addition and subtraction to length. Take away Tape Diagrams Using Bar Use addition and subtraction within 100 to solve word Set Strips Models: problems involving lengths that are given in the same Compare Addition and units, e.g., by using drawings (such as drawings of Students can build the models Subtraction rulers) and equations with a symbol for the unknown with strips of paper before number to represent the problem. drawing. The strips can be cut one for from colored stock paper or plain Represent whole numbers as lengths from 0 on a benchmark number line diagram with equally spaced points colored paper. Strips can be the assessment) corresponding to the numbers 0, 1, 2, ..., and represent whole, halves, thirds, and fourths whole-number sums and differences within 100 on a to have different sizes available.
subtract. 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. Explain why addition and subtraction strategies work, using place value and the properties of operations.1 1 Explanations may be supported by drawings or objects. 182 + 18 190 10 200 Subtraction across zeros can be done by decomposing the base ten number into 1 and 1 less than the number. For example, 200 – 18. Decompose 200 into 199 + 1. Subtract the 18 from 199 and add the one back on. Module 4: Using Bar Models: Addition and Subtraction one for benchmark assessment) Relate addition and subtraction to length. Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units, e.g., by using drawings (such as drawings of rulers) and equations with a symbol for the unknown number to represent the problem. Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a Join Take away Set Compare Visuals: Tape Diagrams Strips Students can build the models with strips of paper before drawing. The strips can be cut from colored stock paper or plain colored paper. Strips can be the whole, halves, thirds, and fourths to have different sizes available.
grade_2_curriculum_math_in_focus.docx