Washington Math Standards - 2nd Grade

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2.1. Core Content: Place value and the base ten system
2.1.A Count by tens or hundreds forward and back-ward from 1 to 1,000, starting at any number.
2.1.B Connect place value models with their numerical equivalents to 1,000. (Counting Squares , Place Value to 1000 )
2.1.C Identify the ones, tens, and hundreds place in a number and the digits occupying them. (Place Value to 1000 )
2.1.D Write three-digit numbers in expanded form. (Place Value to 1000 )
2.1.E Group three-digit numbers into hundreds, tens, and ones in more than one way. (Counting Squares )
2.1.F Compare and order numbers from 0 to 1,000. (Order Numbers to 1000 )

2.2. Core Content: Addition and subtraction
2.2.A Quickly recall basic addition facts and related subtraction facts for sums through 20. (Fast Addition , Fast Addition Reverse , Fast Subtraction , Mixed Addition and Subtraction )
2.2.B Solve addition and subtraction word problems that involve joining, separating, and comparing and verify the solution. (Basic Word Problems )
2.2.C Add and subtract two-digit numbers efficiently and accurately using a procedure that works with all two-digit numbers and explain why the procedure works. (Long Addition to 1000 , Basic Addition to 1000 , Basic Subtraction to 1000 , Long Subtraction to 1000 )
2.2.D Add and subtract two-digit numbers mentally and explain the strategies used. (Long Addition to 1000 , Basic Addition to 1000 , Basic Subtraction to 1000 , Long Subtraction to 1000 )
2.2.E Estimate sums and differences. (Estimated Addition , Estimated Subtraction )
2.2.F Create and state a rule for patterns that can be generated by addition and extend the pattern. (Patterns: Numbers )
2.2.G Solve equations in which the unknown number appears in a variety of positions. (Missing Term )
2.2.H Name each standard U.S. coin, write its value using the $ sign and the ¢ sign, and name combinations of other coins with the same total value. (Making Change 2 )
2.2.I Determine the value of a collection of coins totaling less than $1.00. (Counting Money )

2.3. Core Content: Measurement
2.3.A Identify objects that represent or approximate standard units and use them to measure length.
2.3.B Estimate length using metric and U.S. customary units.
2.3.C Measure length to the nearest whole unit in both metric and U.S. customary units.
2.3.D Describe the relative size among minutes, hours, days, weeks, months, and years.
2.3.E Use both analog and digital clocks to tell time to the minute. (Telling Time )

2.4. Additional Key Content
2.4.A Solve problems involving properties of two- and three-dimensional figures.
2.4.B Collect, organize, represent, and interpret data in bar graphs and picture graphs. (Tally and Pictographs , Bar Graphs )
2.4.C Model and describe multiplication situations in which sets of equal size are joined. (Understanding Multiplication )
2.4.D Model and describe division situations in which sets are separated into equal parts. (Understanding Division )
2.4.E Interpret a fraction as a number of equal parts of a whole or a set. (Fraction Pictures )

2.5. Core Processes: Reasoning, problem solving, and communication (Basic Word Problems )
2.5.A Identify the question(s) asked in a problem and any other questions that need to be answered in order to solve the problem.
2.5.B Identify the given information that can be used to solve a problem.
2.5.C Recognize when additional information is required to solve a problem.
2.5.D Select from a variety of problem-solving strategies and use one or more strategies to solve a problem.
2.5.E Identify the answer(s) to the question(s) in a problem.
2.5.F Describe how a problem was solved.
2.5.G Determine whether a solution to a problem is reasonable.

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