First Grade Online Math Games
Common Core Math Domains:
Clusters with the Standards

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*Operations and Algebraic Thinking 1.OA


Represent and solve problems involving addition and subtraction.
1.OA.1 Use addition and subtraction within 20 to solve word problems.
1.OA.2 Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20.


Understand and apply properties of operations and the relationship between addition and subtraction.
1.OA.3 Apply properties of operations as strategies to add and subtract.
1.OA.4 Understand subtraction as an unknownaddend problem.


Add and subtract within 20.
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.


Work with addition and subtraction equations.
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 to three whole numbers.


*Number and Operations in Base Ten 1.NBT


Extend the counting sequence.
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.


Understand place value.
1.NBT.2 Understand that the two digits of a twodigit number represent amounts of tens and ones.
1.NBT.2a 10 can be thought of as a bundle of ten onescalled a “ten.”
1.NBT.2b 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.2c 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 twodigit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >,=, and <.


Use place value understanding and properties of operations to add and subtract.
1.NBT.4 Add within 100, including adding a twodigit number and a onedigit number, and adding a twodigit number and a multiple of 10.
1.NBT.5 Given a twodigit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
1.NBT.6 Subtract multiples of 10 in the range 1090 from multiples of 10 in the range 1090; relate the strategy to a written method and explain the reasoning used.


*Measurement and Data 1.MD


Measure lengths indirectly and by iterating length units.
1.MD.1 Order three objects by length; compare the lengths of two objects indirectly by using a third object.
1.MD.2 Express the length of an object as a whole number of length units.


Tell and write time.
1.MD.3 Tell and write time in hours and halfhours using analog and digital clocks.
Represent and Interpret data.
1.MD.4 Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how man in each category, and how many more or less are in one category than in another.


*Geometry 1.G


Reason with shapes and their attributes.
1.G.1 Distinguish between defining attributes; build and draw shapes to possess defining attributes.
1.G.2. Compose twodimensional shapes (rectangles, squares, trapezoids, triangles, halfcircles, and quartercircles) or threedimensional 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 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, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.
