Standards For Mathematical Practice  
2nd Grade Module 4  
2nd Grade Module 5  
2nd Grade Module 6  
2nd Grade


Operations & Algebraic Thinking

Resources 
Represent and solve problems involving addition and subtraction.  
2.OA.A.1 Use addition and subtraction within 100 to solve one and twostep 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.  
Add and subtract within 20.  
2.OA.B.2 Fluently add and subtract within 20 using mental strategies.^{2} By end of Grade 2, know from memory all sums of two onedigit numbers.  
Work with equal groups of objects to gain foundations for multiplication.  
2.OA.C.3 Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.  
2.OA.C.4 Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.  
Number & Operations in Base Ten


Understand place value. 

2.NBT.A.1 Understand that the three digits of a threedigit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:  
a. 100 can be thought of as a bundle of ten tens — called a “hundred.”  
b. The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).  
2.NBT.A.2 Count within 1000; skipcount by 2′s, 5s, 10s, and 100s. CA  
2.NBT.A.3 Read and write numbers to 1000 using baseten numerals, number names, and expanded form.  
2.NBT.A.4 Compare two threedigit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.  
Use place value understanding and properties of operations to add and subtract.  
2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.  
2.NBT.B.6 Add up to four twodigit numbers using strategies based on place value and properties of operations.  
2.NBT.B.7 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 threedigit 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.  
7.1 Use estimation strategies to make reasonable estimates in problem solving. CA  
2.NBT.B.8 Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.  
2.NBT.B.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.  
Measurement & Data 

Measure and estimate lengths in standard units.  
2.MD.A.1 Measure the length of an object by selecting and using appropriate tools such as rulers, yardsticks, meter sticks, and measuring tapes.  
2.MD.A.2 Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen.  
2.MD.A.3 Estimate lengths using units of inches, feet, centimeters, and meters.  
2.MD.A.4 Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit.  
Relate addition and subtraction to length.  
2.MD.B.5 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.  
2.MD.B.6 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 wholenumber sums and differences within 100 on a number line diagram.  
Work with time and money.  
2.MD.C.7 Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m. Know relationships of time (e.g., minutes in an hour, days in a month, weeks in a year). CA  
2.MD.C.8 Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and ¢ symbols appropriately. Example: If you have 2 dimes and 3 pennies, how many cents do you have?  
Represent and interpret data.  
2.MD.D.9 Generate measurement data by measuring lengths of several objects to the nearest whole unit, or by making repeated measurements of the same object. Show the measurements by making a line plot, where the horizontal scale is marked off in wholenumber units.  
2.MD.D.10 Draw a picture graph and a bar graph (with singleunit scale) to represent a data set with up to four categories. Solve simple puttogether, takeapart, and compare problems^{1} using information presented in a bar graph.  
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