Free Games and Activities from Mathville.com
Correlated to the Common Core State Standards for Mathematics

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### Operations and Algebraic Thinking 1.OA

#### Represent and solve problems involving addition and subtraction.

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.
Word Problems - Subtract
Word Problems - Addition and Subtraction
Make 10
Count 10 Domino Game
Make 20 Solitaire

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.
Math Sentences

#### Understand and apply properties of operations and the relationship between addition and subtraction.

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.)

Math Apples
Make 10
Count 10 Domino Game

Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
Math Apples
Make 10
Count 10 Domino Game

#### Add and subtract within 20.

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

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).
Math Apples
Make 10
Count 10 Domino Game
Make 20 Solitaire
Math Mystery Pictures: Add and Subtract Within 20

#### Work with addition and subtraction equations.

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.
Math Apples
Math Sentences

Determine the unknown whole number in an addition or subtraction equation relating to 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 = ?
Math Apples
Math Sentences
Make 10
Make 20 Solitaire

### Number and Operations in Base Ten 1.NBT

#### Extend the counting sequence.

Count to 120, starting at any number less than 120.
Connect the Dots Math Mystery Picture Game: Count to 50
Connect the Dots Math Mystery Picture Game: Count to 120

#### Understand place value.

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
a. 10 can be thought of as a bundle of ten ones — called a “ten.”
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
c. 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).
Place Value Riddles
Make 20 Solitaire
Make 10 Tens Solitaire

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

#### Use place value understanding and properties of operations to add and subtract.

Add within 100. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
Math Mystery Picture: Add and Subtract Within 100 Without Regrouping
Math Mystery Pictures: Add and Subtract Within 100 With Regrouping

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Place Value Riddles
Tic Tac (Add or Subtract) Ten

Subtract 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.
Place Value Riddles
Make 10 Tens Solitaire

### Measurement and Data 1.MD

#### Measure lengths indirectly and by iterating length units.

Order three objects by length.
Order by Length

#### Tell and write time.

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

#### Represent and interpret data.

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.
Make Graphs

### Geometry 1.G

#### Reason with shapes and their attributes.

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.
Pick a Shape
Name Ten Shapes
Sort 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.
Make a Shape

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.
Equal Shares