In Grade 1, instructional time should focus on four critical areas:
(1) developing understanding of addition, subtraction, and strategies for addition and subtraction within 20;
(2) developing understanding of whole number relationships and place value, including grouping in tens and ones;
(3) developing understanding of linear measurement and measuring lengths as iterating length units; and
(4) reasoning about attributes of, and composing and decomposing geometric shapes.
Southern Cross Consultancy have developed over 100 handson games, Math centers and activities for use in the classroom utilizing the "I Can" format to reinforce the studentfriendly instructions, reinforcing student independence.
The Grade 1 Math CCSS Games Packet includes:
OPERATIONS AND ALGEBRAIC THINKING  

Represent and solve problems involving addition and subtraction.  
1OA1. 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. 
Add To Change Unknown to 10* 

1OA2. 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. 
One Watermelon Seed (www.amazon.com) Rolling and Adding 

Understand and apply properties of operations and the relationship between addition and subtraction.  
1OA3. Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.) 
Domino Turn Arounds Turn Around Facts* 

1OA4. Understand subtraction as an unknownaddend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.  Addition Subtraction Heads Up* How Many are Hiding Under the Cup? How Many Are Hiding?* Subtracting and Adding to 10* Subtracting and Adding to 20* Subtraction Bag* 

Add and subtract within 20.  
1OA5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). 
1 More Than, 1 Less Than Bingo to 20 

1OA6. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). 
5 Plus, Plus 5* 

Work with addition and subtraction equations.  
1OA7. Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.  Sorting True or False* True or Not True 

1OA8. Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ – 3, 6 + 6 = _.  Complete the Equation  
NUMBER AND OPERATIONS IN BASE TEN  
Extend the counting sequence.  
1NBT1. 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. 
Count Down Counting on the Grid* Forwards Counting From Any Decades Number 1989* Forwards Counting From Any Number 1669* 

Understand place value.  
1NBT2. Understand that the two digits of a twodigit number represent amounts of tens and ones. Understand the following as special cases: 1NBT2a. 10 can be thought of as a bundle of ten ones — called a “ten.” 1NBT2b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. 1NBT2c. 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). 
Groups of Ten* 

1NBT3. Compare two twodigit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <. 
Flash* Vertical Number Line 

Use place value understanding and properties of operations to add and subtract.  
1NBT4. Add within 100, including adding a twodigit number and a onedigit number, and adding a twodigit 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 twodigit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.  Add 10 More* First to 100 Wins Mystery Number Game* Plus 10* 

1NBT5. Given a twodigit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used. 
10 More, 10 Less Journey by 10's* Subtract 10* 

1NBT6. Subtract multiples of 10 in the range 1090 from multiples of 10 in the range 1090 (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.  Subtract 10 from Multiples of 10  
MEASUREMENT AND DATA  
Measure lengths indirectly and by iterating length units.  
1MD1. Order three objects by length; compare the lengths of two objects indirectly by using a third object.  Comparing and Ordering Lengths  
1MD2. 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 samesize length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.  Estimate and Measure* Longer or Shorter Names 

Tell and write time and money.  
1MD3. Tell and write time in hours and halfhours using analog and digital clocks. Recognise and identify coins, their names, and their value. 
Penny Dime Dollar Exchange* Penny Nickel Dime Exchange* Penny Nickel Dime Quarter Exchange* Penny Nickel Exchange Time Bump Set A* Time Bump Set B* Time is of the Essence* 

Represent and interpret data.  
1MD4. 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  
Reason with shapes and their attributes  
1G1. Distinguish between defining attributes (e.g., triangles are closed and threesided) versus nondefining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes. 
Shape Sort Squares and Not Squares* Toothpick Shapes* Triangles and Not Triangles* What’s My Shape* 

1G2. 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.  Different Shapes with 2 Triangles* Different Sized Squares* Different Ways to Cover a Hexagon* Geoboard Shapes Mosaic Puzzle Version 1* Mosaic Puzzle Version 2* Mosaic Puzzle Version 3* Mosaic Puzzle Version 4* Pattern Block Puzzles 

1G3. 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. 