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This page provides examples of 1st Grade Number Activities aligned with the Common Core State Standards. All activities are suitable for use in Math Centers, small groups, or whole class settings and are designed to provide opportunities for students to communicate their reasoning and mathematical thinking. All files for the 1st Grade Number Activities listed are in PDF format and can be accessed using Adobe Reader. 
1st GRADE NUMBER ACTIVITIES: OPERATIONS AND ALGEBRAIC THINKING
Represent and solve problems involving addition and subtraction
1.OA1
Use addition and subtraction within 20 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.
1.OA2 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.
Possible Activities: 
Understand and apply properties of operations and the relationship between addition and subtraction
1.OA3
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) 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).
Possible Activities: 
1.OA4 Understand subtraction as an unknownaddend problem. For
example, subtract 108 by finding the number that makes 10 when added to
8.
Possible Activities:
Ten Frame Subtraction
Subtract from 10
Add and subtract within 20
1.OA5 Relate counting to addition and subtraction (e.g. by counting on 2 to add 2).
Possible Activities: 
1.OA6
Add and subtract within 20, demonstrating fluency for addition and
subtraction within 10. Use strategies such as counting on; making ten
(e.g. 8+6=8+2+4=10+4=14); decomposing a number leading to a ten (e.g.,
134=1331=101=9); using the relationship between addition and
subtraction (e.g. knowing that 8+4=12, one knows 128=4); and creating
equivalent but easier or known sums (e.g., adding 6+7 by creating the
known equivalent 6+6+1 =12+1=13).
Work with addition and subtraction equations
1.OA7 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=81, 5+2=2+5 ,
4+1=5+2
Possible Activities:
True or False?
Equal Sums
1.OA8 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 = □
Possible Activities:
Find the Missing Number
1st GRADE NUMBER ACTIVITIES: NUMBER AND OPERATIONS IN BASE TEN
Extend the counting sequence
1.NBT1 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.
Possible Activities:
Missing Number Grids 150
Understand place value
1.NBT2
Understand that the two digits of a twodigit 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).
Possible Activities: 
1.NBT3 Compare two twodigit numbers based on meanings of the
tens and ones digits, recording the results of comparisons with the
symbols >, =, and <.
Possible Activities:
Ten Frame Compare
Comparing Two Digit Numbers
Scoop It
Use place value understanding and properties of operations to add and subtract
1.NBT4 Add
within 100, including adding a twodigit number and a onedigit number,
and adding a twodigit 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 twodigit numbers, one adds tens and tens,
ones and ones, and sometimes it is necessary to compose a ten.
1.NBT5 Given a twodigit number, mentally find 10 more or 10 less than the
number, without having to count; explain the reasoning used.
Possible Activities:
Ten More
Race Around (10) ver.1
1.NBT6 Subtract multiples of 10 in the range 1090 from multiples of 10 in the
range 1090 (positive or zero differences), 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.
Possible Activities:
Subtracting Sets of Ten
Subtracting Multiples of Ten
More 1st Grade Number Resources