2ND GRADE NUMBER

OPERATIONS AND ALGEBRAIC THINKING

Represent and solve problems involving addition and subtraction 

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

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 Word Problems (within 100)
Take From: Result Unknown Word Problems (within 100)
Math Literature Link: Two of Everything
Math Literature Link: The Napping House
Math Literature Link: Counting Crocodiles
Math Literature Link: Night Noises
Math Literature Link: The Shopping Basket
Math Literature Link: My Little Sister Ate One Hare
Also included in 2nd Grade Math Centers:
Add to: Change Unknown Word Problems (within 100)
Add To: Start Unknown Word Problems (within 100)
Take From: Change Unknown Word Problems (within 100)
Take From: Start Unknown Word Problems (within 100)
Put Together/Take Apart: Total Unknown Word Problems (within 100)
Put Together/Take Apart: Addend Unknown Word Problems (within 100)
Compare: Difference Unknown Word Problems (within 100)
Compare: Bigger Unknown Word Problems (within 100) 
Compare: Smaller Unknown Word Problems (within 100)
Two Step Word Problems (within 100)

Add and subtract within 20

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
Magic Squares
Sum Search
Four in a Row Subtraction
Doubles Plus Two
Also included in 2nd Grade Math Centers:
Doubles Bump
Doubles Memory
Doubles Cover Up (v.1- 2)
Doubles Plus One (v.1)
Doubles Minus One (v.1)
Doubles Minus Two (v.1)
Make a Ten (v.1- 3)
Make a Ten Path (v.1)
The Difference Game (v.1- 4)
Number Wheel Spin (v.1)
Number Relationship Mat
Magic Star 
Magic Triangle
11 More
Near 20

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
Math Literature Link: 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:
Race to 100
Base 10 Concentration (v.2)
Also included in 2nd Grade Math Centers:
Representing Multiples of 100
Representing Numbers with Four Blocks
Make Ten Bundles
Race to Zero
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)
Math Literature Link: 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
Skip Counting Patterns (v.1-2)
Skip Counting Sequences
Skip Counting Towers
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:
Roll 3 Digits
Numeral Writing Barrier Game
Also included in 2nd Grade Math Centers:
Number Word Concentration
Make Six Numbers

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:
Place Value Triangle (v.1)
Build and Compare
Order Up

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:
2-Digit Addition Trains (v.1-2)
Doubles Plus One (v.2)
Also included in 2nd Grade Math Centers:
2-Digit Addition on an Open Number Line (v.1-2)
2-Digit Subtraction on an Open No. Line (v.1-3)
Four in a Row with Near Doubles
2-Digit Addition Split
2-Digit Subtraction Split 
Keep on Doubling
Doubles Plus Two (v. 2)
Doubles Minus One (v. 2)
Doubles Minus Two (v. 2)
Make a Ten Cover Up (v. 2)
Make a Ten Path (v. 2)
Number Wheel Spin (v. 2)
Close to 100
Close to Zero 

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:
Three Addend Word Problems 
Add Three Addends
Add Four Addends

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 Bag: Addition
Base Ten Pictures
3-Digit Addition Split
Also included in 2nd Grade Math Centers:
3-Digit Addition on an Open Number Line (v.1- 2)
3-Digit Subtraction on an Open Number Line (v.1-3)
3-Digit Subtraction Split
Base Ten Bag: Subtraction
Base Ten Buildings
Make a Ten Path (v.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
Race Around + 10 (v. 2)
Race Around - 10 (v.2-3)
Add 10 Number Paths
Subtract 10 Number Paths
Add 10 and 100

2.NBT.B.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.
Included in 2nd Grade Math Centers:
Explaining Addition and Subtraction Strategies (20 Task Cards)