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.
2.OA.C. 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
2.NBT.A. Understand place value.
2.NBT.A.1. Understand that the three digits of a three-digit 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:
2.NBT.A.1a. 100 can be thought of as a bundle of ten tens — called a “hundred.”
2.NBT.A.1b. 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; skip-count by 5s, 10s, and 100s.
2.NBT.A.3. Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
2.NBT.A.4. Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and
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.6. Add up to four two-digit 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 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.
Explanations may be supported by drawings or objects.
2.MD.A. 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.4. Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit.
2.MD.B. Relate addition and subtraction to length.
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 whole-number sums and differences within 100 on a number line diagram.
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?
2.G.A. Reason with shapes and their attributes.
2.G.A.3 Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.
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Students will have opportunities to:
- Make sense of their problem. (MP.1)
- Reflect on their thinking as they solve the problem. (MP.1)
- Keep trying when their problem is hard. (MP.1)
- Check whether their answer makes sense. (MP.1)
- Solve problems in more than one way. (MP.1)
- Compare their strategies with others. (MP.1)
- Create mathematical representations using numbers, words, pictures, symbols, gestures, tables, graphs, and concrete objects. (MP.2)
- Make sense of the representations others use. (MP.2)
- Make connections between representations. (MP.2)
estimate, equal share, expand-and-trade subtraction, four-fourths, fourth-inch, half-inch, multiple, one-fourth, one-half, one-quarter, one-third, precise, quarter-inch, reasonable, thousand cube, three-thirds, two-halves
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