
2nd GRADE NUMBER ACTIVITIES: 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: 
Also included in 2nd Grade Math Centers: 
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 onedigit numbers.
Sample Activities: 
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 Read Aloud Task Cards:
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
2nd GRADE NUMBER ACTIVITIES: NUMBER AND OPERATIONS IN BASE TEN
Understand place value
2.NBT.A.1 Understand that the three
digits of a threedigit 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 (ver.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 (ver. 4)
Math Read Aloud Task Card:
Two Ways to Count to Ten
Also included in 2nd Grade Math Centers:
** Count by Fives (ver. 13)
** Count by Tens (ver. 1 4)
** Skip Counting Cards
** My Skip Counting Patterns Book
2.NBT.A.3 Read and write numbers to 1000 using baseten 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 threedigit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols.
Sample Activities:
Comparing 3 Digit Numbers
Place Value Challenge (ver. 1)
Also included in 2nd Grade Math Centers:
** Build and Compare
** Order Up
** Place Value Triangle (ver. 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
2Digit Addition Split
Also included in 2nd Grade Math Centers:
** 2 Digit Subtraction Split
** Base Ten Bag: Subtraction
** 2 Digit Addition Trains (ver. 1 & 2)
** Doubles Plus One (ver. 2)
** Doubles Plus Two (ver. 2)
** Doubles Minus One (ver. 2)
** Doubles Minus Two (ver. 2)
** Four in a Row with Near Doubles
** Make a Ten Cover Up (ver. 2)
** Make a Ten Path (ver. 2)
** Number Wheel Spin (ver. 2)
** Four in a Row with Near Doubles (ver. 2 & 3)
** Close to One Hundred
** Close to Zero
** 2Digit Addition on an Open Number Line (ver. 1 & 2)
** 2Digit Subtraction on an Open Number Line (ver. 13)
2.NBT.B.6 Add up to four twodigit numbers using strategies based on place value and properties of operations.
Sample Activity:
Make 100
Also included in 2nd Grade Math Centers:
** Add Three Addends
** Add Four Addends
** Three Addend Word Problems
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 threedigit
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
3Digit Addition Split
Also included in 2nd Grade Math Centers:
** 3Digit Subtraction Split
** Base Ten Bag: Subtraction
** Base Ten Buildings
** Make a Ten Path (ver. 3)
** 3Digit Addition on an Open Number Line (ver. 1 & 2)
** 3Digit Subtraction on an Open Number Line (ver. 13)
2.NBT.B.8 Mentally add 10 or 100 to a given number 100900 and mentally subtract 10 or 100 from a given number 100900.
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
** Add 10 and 100
** Subtract 10 and 100
** Race Around + 10 (ver. 2)
** Race Around  10 (ver. 2 & 3)
** Add 10 Number Paths
** Subtract 10 Number Paths
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)