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2.NS
Number Sense
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2.NS.1.0
Students understand the relationship between numbers, quantities, and place value in whole numbers up to 1,000:
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2.NS.1.1
Count, read, and write whole numbers to 1,000 and identify the place value for each digit.
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2.NS.1.2
Use words, models, and expanded forms (e.g., 45 = 4 tens + 5) to represent numbers (to 1,000).
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2.NS.1.3
Order and compare whole numbers to 1,000 by using the symbols <, =, >.
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2.NS.2.0
Students estimate, calculate, and solve problems involving addition and subtraction of two- and three-digit numbers:
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2.NS.2.1
Understand and use the inverse relationship between addition and subtraction (e.g., an opposite number sentence for 8 + 6 = 14 is 14 - 6 = 8) to solve problems and check solutions.
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2.NS.2.2
Find the sum or difference of two whole numbers up to three digits long.
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2.NS.2.3
Use mental arithmetic to find the sum or difference of two two-digit numbers.
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2.NS.3.0
Students model and solve simple problems involving multiplication and division:
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2.NS.3.1
Use repeated addition, arrays, and counting by multiples to do multiplication.
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2.NS.3.2
Use repeated subtraction, equal sharing, and forming equal groups with remainders to do division.
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2.NS.3.3
Know the multiplication tables of 2s, 5s, and 10s (to "times 10") and commit them to memory.
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2.NS.4.0
Students understand that fractions and decimals may refer to parts of a set and parts of a whole:
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2.NS.4.1
Recognize, name, and compare unit fractions from 1/12 to 1/2.
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2.NS.4.2
Recognize fractions of a whole and parts of a group (e.g., one-fourth of a pie, two-thirds of 15 balls).
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2.NS.4.3
Know that when all fractional parts are included, such as four-fourths, the result is equal to the whole and to one.
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2.NS.5.0
Students model and solve problems by representing, adding, and subtracting amounts of money:
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2.NS.5.1
Solve problems using combinations of coins and bills.
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2.NS.5.2
Know and use the decimal notation and the dollar and cent symbols for money.
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2.NS.6.0
Students use estimation strategies in computation and problem solving that involve numbers that use the ones, tens, hundreds, and thousands places:
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2.NS.6.1
Recognize when an estimate is reasonable in measurements (e.g., closest inch).
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2.AF
Algebra and Functions
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2.AF.1.0
Students model, represent, and interpret number relationships to create and solve problems involving addition and subtraction:
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2.AF.1.1
Use the commutative and associative rules to simplify mental calculations and to check results.
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2.AF.1.2
Relate problem situations to number sentences involving addition and subtraction.
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2.AF.1.3
Solve addition and subtraction problems by using data from simple charts, picture graphs, and number sentences.
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2.MG
Measurement and Geometry
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2.MG.1.0
Students understand that measurement is accomplished by identifying a unit of measure, iterating (repeating) that unit, and comparing it to the item to be measured:
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2.MG.1.1
Measure the length of objects by iterating (repeating) a nonstandard or standard unit.
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2.MG.1.2
Use different units to measure the same object and predict whether the measure will be greater or smaller when a different unit is used.
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2.MG.1.3
Measure the length of an object to the nearest inch and/or centimeter.
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2.MG.1.4
Tell time to the nearest quarter hour and know relationships of time (e.g., minutes in an hour, days in a month, weeks in a year).
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2.MG.1.5
Determine the duration of intervals of time in hours (e.g., 11:00 a.m. to 4:00 p.m.).
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2.MG.2.0
Students identify and describe the attributes of common figures in the plane and of common objects in space:
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2.MG.2.1
Describe and classify plane and solid geometric shapes (e.g., circle, triangle, square, rectangle, sphere, pyramid, cube, rectangular prism) according to the number and shape of faces, edges, and vertices.
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2.MG.2.2
Put shapes together and take them apart to form other shapes (e.g., two congruent right triangles can be arranged to form a rectangle).
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2.SDAP
Statistics, Data Analysis, and Probability
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2.SDAP.1.0
Students collect numerical data and record, organize, display, and interpret the data on bar graphs and other representations:
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2.SDAP.1.1
Record numerical data in systematic ways, keeping track of what has been counted.
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2.SDAP.1.2
Represent the same data set in more than one way (e.g., bar graphs and charts with tallies).
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2.SDAP.1.3
Identify features of data sets (range and mode).
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2.SDAP.1.4
Ask and answer simple questions related to data representations.
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2.SDAP.2.0
Students demonstrate an understanding of patterns and how patterns grow and describe them in general ways:
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2.SDAP.2.1
Recognize, describe, and extend patterns and determine a next term in linear patterns (e.g., 4, 8, 12 ...; the number of ears on one horse, two horses, three horses, four horses).
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2.SDAP.2.2
Solve problems involving simple number patterns.
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2.MR
Mathematical Reasoning
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2.MR.1.0
Students make decisions about how to set up a problem:
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2.MR.1.1
Determine the approach, materials, and strategies to be used.
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2.MR.1.2
Use tools, such as manipulatives or sketches, to model problems.
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2.MR.2.0
Students solve problems and justify their reasoning:
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2.MR.2.1
Defend the reasoning used and justify the procedures selected.
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2.MR.2.2
Make precise calculations and check the validity of the results in the context of the problem.
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2.MR.3.0
Students note connections between one problem and another.
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