This page provides samples of 1st grade number activities suitable for use in math centers, small group, or whole class settings. All activities are designed to elicit a range of responses and provide opportunities for students to communicate their reasoning and mathematical thinking. Download the sample activities under each standard or purchase the 1st Grade Math Centers eBook and have all the Number, Geometry, Measurement and Data Centers you’ll need for the entire school year in one convenient digital file.

**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:**

Add To: Start Unknown

Take From: Result Unknown Word Problems

Take From: Start Unknown Word Problems

Put Together/Take Apart: Total Unknown Word Problems

Put Together/Take Apart: Both Addends Unknown Word Problems

Put Together/Take Apart: Addend Unknown Word Problems

Compare: Difference Unknown Word Problems

Compare: Bigger Unknown Word Problems

Compare: Smaller Unknown Word Problems

Mixed Addition/Subtraction Word Problems

**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.**

Three Addends Word Problems

Three Addends Unknown Problem Cards

**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**** 1st Grade Math Centers:**

Domino Fact Families**Three AddendsFind Three Cards**

Subtract from 10

Think Addition for 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**

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)

Four in a Row Subtraction

Part Part Whole Cards

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. 3)

Sums of Ten

Doubles Plus One Towers

The Difference Game (v. 1-3)

**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 Activity:**

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 Activity:**

Find the Missing Number

**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

**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 **

My Double Ten-Frame Riddle

Comparing Two Digit Numbers

Scoop It

Ten Frame Compare

Greater Than 50

Who Has the Greater Sum? (v. 1)

**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 ****Subtract 10 on the Number Line** **Lucky Six**

Adding Tens to a 2-Digit Number

Add Ten on the Number Line

What Number is ...?

Ten More

Race Around -10 (v.1)

Subtract Ten

Subtract Multiples of Ten