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## Operations and Algebraic Thinking

1.OA.1

Word Problems

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

1.OA.3

Number Families

Apply properties of operations as strategies to add and subtract.

1.OA.4

Number Families

Understand subtraction as an unknown-addend problem.

1.OA.5

Skip Counting

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

1.OA.6.i

Add and Subtract Up to 20

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.

1.OA.6.ii

Add and Subtract Up to 20

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.

1.OA.7

What is Equal?

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.

1.OA.8

Find the Missing Number

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

## Number and Operations in Base Ten

1.NBT.2.a

Place Value & Tens and Ones

10 can be thought of as a bundle of ten ones - called a "ten."

1.NBT.2.b

Place Value & Tens and Ones

The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

1.NBT.2.c

Place Value & Tens and Ones

The 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.3

Compare Numbers

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

1.NBT.4

Add 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.5

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

## Measurement and Data

1.MD.1

Order Three Objects by Length

Order three objects by length; compare the lengths of two objects indirectly by using a third object.

1.MD.2

Measure Without a Ruler

Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.

1.MD.3

Tell Time to the Half Hour

Tell and write time in hours and half-hours using analog and digital clocks.

1.MD.3

Tell Time to the Hour

Tell and write time in hours and half-hours using analog and digital clocks.

1.MD.4

Sort and Count Objects

Organize, 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.

## Geometry

1.G.1

Distinguish 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.1

Draw Shapes

Distinguish 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.2

Build With Shapes

Compose 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.3

Dividing Shapes

Partition 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. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.