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This page provides examples of 2nd Grade Number Activities aligned with the Common Core State Standards. All activities are suitable for use in Math Centers, small group or whole class settings and are designed to elicit a range of responses and provide opportunities for students to communicate their reasoning and mathematical thinking. All files for the 2nd Grade Number Activities listed are in PDF format and can be accessed using Adobe Reader. 
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.OA1
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.
Possible Activities:
Add to: Change Unknown Problems (to 100)
Add to: Start Unknown Problems (to 100)
Take From: Change Unknown Problems (to 100)
Take From: Start Unknown Problems (to 100
Word Problems (One Step)
Word Problems (Two Step)
Math Read Aloud Task Cards: One Hunter P. Bear's New Year's Party The Napping House Two of Everything 
Add and subtract within 20
2.OA2 Fluently add and
subtract within 20 using mental strategies. By end of Grade 2, know from
memory all sums of two onedigit numbers.
Work with equal groups of objects to gain foundations for multiplication
2.OA3 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.
Possible Activities: 
2.OA4 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.
Possible Activities:
Making Arrays
Building Arrays
Making Different Sized Squares
2nd GRADE NUMBER ACTIVITIES: NUMBER AND OPERATIONS IN BASE TEN
Understand place value
2.NBT1 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).
Possible Activities: 
2.NBT2 Count within 1000; skip count by 2s, 5s, 10s, and 100s.
Possible Activities:
Count by Fives Game
Count by Tens Game
Counting Collections
Skip Counting Cards
Math Read Aloud Task Card: 
2.NBT3 Read and write numbers to 1000 using baseten notation, number names, and expanded form.
Possible Activities:
Make Six Numbers
Number Word Concentration
Representing Numbers in 4 Ways
Roll 3 Digits
Number Writing Barrier Game
2.NBT4 Compare two threedigit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols.
Possible Activities:
Comparing 3 Digit Numbers
Place Value Challenge (3 Digits)
Use place value understanding and properties of operations to add and subtract
2.NBT5
Fluently add and subtract within 100 using strategies based on place
value, properties of operations, and/or the relationship between
addition and subtraction.
2.NBT6 Add up to four twodigit numbers using strategies based on place value and properties of operations.
Possible Activities:
Make 100
Twodigit Addition Word Problems
2.NBT7 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.
2.NBT8 Mentally add 10 or 100 to a given number 100900 and mentally subtract 10 or 100 from a given number 100900.
Possible Activities: 
2.NBT9 Explain why addition and subtraction strategies work, using place value and the properties of operations.
Possible Activities:
Finding Sums