Common Core State Standards for Mathematics - Grade 1
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|Operations and Algebraic Thinking|
|Represent and solve problems involving addition and subtraction.|
|1.OA.1 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.2 Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
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|Understand and apply properties of operations and the relationship between addition and subtraction.
Add and subtract within 20.
Work with addition and subtraction equations.
|1.OA.3 Apply properties of operations as strategies to add and subtract.
1.OA.4 Understand subtraction as an unknown-addend problem.
1.OA.5 Relate counting to addition and subtraction.
1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.
1.OA.7 Understand the meaning of the equal sign and determine if equations involving addition and subtraction are true or false.
1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
|Jet Ski Addition||Island Chase Subtraction||Tug Team Addition||Minus Mission||Kitten Match|
|Alien Addition||Math Lines 10 to 20||Ducky Race Subtraction||Sailboat Subtraction|
|Number and Operations in Base 10|
|Extend the counting sequence, understand place value, and apply place value understanding.|
1.NBT.1 Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.
1.NBT.3 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.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|
|Measure lengths, tell and write time, and represent and interpret data.|
1.MD.1 Order three objects by length; compare the lengths of two objects indirectly by using a third object.
1.MD.3 Tell and write time in hours and half-hours using analog and digital clocks.
|Reason with shapes and their attributes|
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.3 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.
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