1.OA Operations & Algebraic Thinking
1.OA.A Represent and solve problems involving addition and subtraction
1.OA.B Understand and apply properties of operations and the relationship between addition and subtraction
1.OA.C Add and subtract within 20
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1.OA.C.5Relate counting to addition and subtraction. -
1.OA.C.6Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.
1.NBT Number & Operations in Base Ten
1.NBT.A Extend the counting sequence
1.NBT.B Understand place value
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1.NBT.B.2Understand that the two digits of a two-digit number represent amounts of tens and ones. -
1.NBT.B.2.A10 can be thought of as a bundle of ten ones — called a 'ten.' -
1.NBT.B.2.BThe numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. -
1.NBT.B.2.CThe numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones). -
1.NBT.B.3Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
1.NBT.C Use place value understanding and properties of operations to add and subtract
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1.NBT.C.4Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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 and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. -
1.NBT.C.5Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used. -
1.NBT.C.6Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90 (positive or zero differences), 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 and explain the reasoning used.
1.MD Measurement & Data
1.MD.A Measure lengths indirectly and by iterating length units
1.MD.B Tell and write time
1.MD.C Represent and interpret data
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1.MD.C.4Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many in each category, and how many more or less are in one category than in another.
1.G Geometry
1.G.A Reason with shapes and their attributes
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1.G.A.1Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes. -
1.G.A.2Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape. -
1.G.A.3Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of.