NUMBER ACTIVITIES
ALIGNED WITH COMMON
CORE
STATE STANDARDS

OPERATIONS AND ALGEBRAIC THINKING

Represent and solve problems involving addition and subtraction
1.OA.A.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 drawings and equations with a symbol for the unknown number to represent the problem
Sample Activities:
Take From: Change Unknown
Bunk Bed Problem
Double Decker Bus Problem
One Duck Stuck
The Very Hungry Caterpillar
One Hunter
Rooster's Off to See the World
Two of Everything
Mouse Count
Ten Flashing Fireflies
Also included in 1st Grade Math Centers:
Word Problems (within 20):
Take From: Result Unknown
Take From: Start Unknown
Put Together/Take Apart: Total Unknown
Put Together/Take Apart: Both Addends Unknown
Compare: Difference Unknown
Compare: Bigger Unknown
Compare: Smaller Unknown

1.OA.A.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.
Sample Activities:
Find 3 Cards
Also included in 1st Grade Math Centers:

Understand and apply properties of operations and the relationship between addition and subtraction
1.OA.B.3 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).
Sample Activities:

Turn Around Trains
Turn Around Dominoes
Also included in

Domino Fact Families

1.OA.B.4 Understand subtraction as an unknown-addend problem. For example, subtract 10-8 by finding the number that makes 10 when added to 8.
Sample Activity:

Subtract from 10
Also included in 1st Grade Math Centers:

Ten Frame Subtraction

1.OA.C.5 Relate counting to addition and subtraction (e.g. by counting on 2 to add 2).
Sample Activities:
Show One More
Show One Less
Also included in 1st Grade Math Centers:
Count on Cover Up (v.1)
Count on Cover Up (v. 2)
Show One More/One Less

1.OA.C.6  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).
Sample Activities:
Count On One (v. 1)
Count On One (v. 2)
Count On Two (v. 1)
Count On Three (v. 1)
Doubles Cover Up (v. 2)
Find Ten
Making Ten (v. 1)

Part Part Whole Cards
Also included in 1st Grade Math Centers:

Count On Two (v. 2)
Count On Three (v. 2)
Count On Cover Up (within 10)
Doubles Cover Up (v. 1)
Doubles Towers
Doubles Path
Doubles Concentration
Cuisenaire Doubles
Make 10 with Cuisenaire Rods
Make Ten on the Ten Frame
Towers of Ten
Making Ten (v. 2)
Making Ten (v. 3)
Sums of Ten

Doubles Plus One Towers
Doubles Plus Two Towers
Math Fact Sort (Set 1 & 2)
Race to 50
Fact Family House
Build a Cuisenaire House
The Difference Game (v. 1-3)

Work with addition and subtraction equations
1.OA.D.7 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
Sample Activities:

True or False?
Also included in 1st Grade Math Centers:
Equal Sums

1.OA.D.8 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 = □
Sample Activities:

Find the Missing Number

NUMBER AND OPERATIONS IN BASE TEN

Extend the counting sequence
1.NBT.A.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.
Sample Activities:
Missing Number Grids 1-50
Also included in 1st Grade Math Centers:
Counting Cards (Set 3)
Ten Frame Path
Base Ten Path
Number Path

Understand place value
1.NBT.B.2 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).
Sample Activities:

Tens and Ones with Snap Cubes
Build a Train
Also included in 1st Grade Math Centers:

Tens and Ones Game
Representing Two Digit Numbers
Base Ten Concentration (2 Digit)
My Double Ten-Frame Riddle

1.NBT.B.3 Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Sample Activities:

Comparing Two Digit Numbers
Scoop It
Also included in 1st Grade Math Centers:
Ten Frame Compare
Greater Than 50
Who Has the Greater Sum? (v. 1)
Who Has the Greater Sum? (v. 2)

Use place value understanding and properties of operations to add and subtract
1.NBT.C.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.
Sample Activities:

Sums of 90

Adding a 2-Digit and One Digit Number
Adding Tens to a 2-Digit Number
Add Ten on the Number Line
What Number is ...?

Addition Split (2 digit + multiple of 10)

1.NBT.C.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Sample Activities:
Ten More
Race Around -10 (v.1)
Also included in 1st Grade Math Centers:
*Race Around + 10 (v. 1)

1.NBT.C.6 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.

Sample Activities:
Subtract Ten
Subtract Multiples of Ten