NUMBER ACTIVITIES

ALIGNED WITH COMMON
CORE
STATE STANDARDS

#### OPERATIONS AND ALGEBRAIC THINKING

2nd Grade Numbers of the Week (Use for morning work or as homework)

Represent and solve problems involving addition and subtraction
2.OA.A.1 Use addition and subtraction within 100 to solve one and two step 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: Result Unknown (within 100)
Take From: Result Unknown (within 100)
One Hunter
P. Bear's New Year's Party
The Napping House
Two of Everything
Also included in 2nd Grade Math Centers:
Word Problems (within 100):

Take From: Change Unknown
Take From: Start Unknown

Put Together/Take Apart: Total Unknown

Compare: Difference Unknown

Compare: Bigger Unknown

Compare: Smaller Unknown

2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Sample Activities:
Find Ten
Making Ten (ver. 1)
Doubles Cover Up (ver. 2)
Four in a Row with Near Doubles
Four in a Row Subtraction
Part Part Whole Cards
11 More
Magic Squares
Sum Search
Also included in 2nd Grade Math Centers:
Doubles Bump
Doubles Memory
Doubles Cover Up (v.1)
Doubles Plus One (v. 1)
Doubles Plus Two (v. 1)
Doubles Minus One (v. 1)
Doubles Minus Two (v. 1)
Making Ten (v. 2 & 3)
Make a Ten Path (v. 1)
The Difference Game (v. 1-4)
Four in a Row Subtraction
Number Wheel Spin (v. 1)
Number Relationship Mat
Near 20
Magic Star
Magic Triangle

Work with equal groups of objects to gain foundations for multiplication
2.OA.C.3 Determine whether a group of objects (up to 20) has an odd or even number of members, e.g. by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.
Sample Activities:
Even Odd Scoop
Even Steven and Odd Todd

Also included in 2nd Grade Math Centers:
Even Slap!
Odd and Even Chase

2.OA.C.4 Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.
Sample Activities:

Roll a Rectangular Array
Making Different Sized Squares
Also included in 2nd Grade Math Centers:
Making Rectangular Arrays
Array Cards
Array Match

#### NUMBER AND OPERATIONS IN BASE TEN

Understand place value
2.NBT.A.1 Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. Understand the following as special cases:
a. 100 can be thought of as a bundle of ten tens – called a “hundred.”
b. The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, nine hundreds (and 0 tens and 0 ones).
Sample Activities:
Make Ten Bundles
Base 10 Concentration (v.2)
Also included in 2nd Grade Math Centers:
Representing Multiples of 100
Race to 100
Race to Zero
Representing Numbers with Four Blocks
Five Ways

2.NBT.A.2 Count within 1000; skip count by 5s,10s, and 100s.
Sample Activities:
Counting Collections
Count by Fives (v. 4)
Two Ways to Count to Ten
Also included in 2nd Grade Math Centers:
Count by Fives (v. 1-3)
Count by Tens (v. 1- 4)
Skip Counting Cards
My Skip Counting Patterns Book

2.NBT.A.3 Read and write numbers to 1000 using base-ten notation, number names, and expanded form.
Sample Activities:
Make Six Numbers
Roll 3 Digits
Numeral Writing Barrier Game
Also included in 2nd Grade Math Centers:
Number Word Concentration

2.NBT.A.4 Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols.
Sample Activities:
Comparing 3 Digit Numbers
Place Value Challenge (v. 1)
Also included in 2nd Grade Math Centers:
Build and Compare
Order Up
Place Value Triangle (v. 1)

Use place value understanding and properties of operations to add and subtract
2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Sample Activities:
Keep on Doubling
Also included in 2nd Grade Math Centers:
2 Digit Subtraction Split
Base Ten Bag: Subtraction
2 Digit Addition Trains (v. 1 & 2)
Doubles Plus One (v. 2)
Doubles Plus Two (v. 2)
Doubles Minus One (v. 2)
Doubles Minus Two (v. 2)
Four in a Row with Near Doubles
Make a Ten Cover Up (v. 2)
Make a Ten Path (v. 2)
Number Wheel Spin (v. 2)
Four in a Row with Near Doubles (v. 2 & 3)
Close to One Hundred
Close to Zero
2-Digit Add. on an Open Number Line (v. 1 & 2)
2-Digit Subtraction on an Open No. Line (v. 1-3)

2.NBT.B.6 Add up to four two-digit numbers using strategies based on place value and properties of operations.
Sample Activity:
Make 100
Also included in 2nd Grade Math Centers:

2.NBT.B.7 Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
Sample Activities:
Base Ten Pictures
Also included in 2nd Grade Math Centers:
3-Digit Subtraction Split
Base Ten Bag: Subtraction
Base Ten Buildings
Make a Ten Path (v. 3)

3-Digit Add. on an Open Number Line (v. 1 & 2)
3-Digit Subtrac, on an Open Number Line (v. 1-3)

2.NBT.B.8 Mentally add 10 or 100 to a given number 100-900 and mentally subtract 10 or 100 from a given number 100-900.
Sample Activities:
Add 10 on a Number Line (3 digit)
Subtract 10 and 100
Also included in 2nd Grade Math Centers:
Subtract 10 on a Number Line
Add 100 on a Number Line
Subtract 100 on a Number Line