Operations & Algebraic Thinking
2.OA.A. Represent and solve problems involving addition and subtraction.
2.OA.A.1. 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.
2.OA.B. Add and subtract within 20.
See standard 1.OA.6 for a list of mental strategies.
Number & Operations in Base Ten
2.NBT.A. Understand place value.
2.NBT.A.2. Count within 1000; skip-count by 5s, 10s, and 100s.
2.NBT.B. 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.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 three-digit 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.
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.MD.C. Work with time and money.
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?
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Students will have opportunities to:
- Create mathematical representations using numbers, words, pictures, symbols, gestures, tables, graphs, and concrete objects (MP.2)
- Make sense of the representations they and others use (MP.2)
- Make connections between representations (MP.2)
- Model real-world situations using graphs, drawings, tables, symbols, numbers, diagrams, and other representations (MP.4)
- Use mathematical models to solve problems and answer questions (MP.4)
- Skip counting and addition strategies can be used to count money.
- Addition can be used to solve word problems involving situations such as “adding to” and “putting together”.
- Numbers can be represented in many ways, such as with pictures, number lines and expanded form.
- The two digits of a 2-digit number represent amounts of tens and ones.
- Place value determines which numbers are larger or smaller than other numbers. (two digit numbers)
- The groupings of ones and tens can be taken apart in different but equivalent ways. For example 56 can be decomposed into 5 tens and 6 ones or 4 tens and 16 ones.
- Addition and subtraction can be used to solve 2 step word problems involving situations such as “adding to”, “putting together”, “taking from”, “taking apart” and “comparison”.
- Skip counting can be used to solve equal group problems.
Addition fact, array, degree Fahrenheit, equivalencies, fact power, mental addition, mental subtraction, open number line, thermometer, total
Bold: Listed in teacher's EDM4 edition
Normal Font: not listed in teacher’s edition as a vocabulary word but will be helpful for students in explanations