
1st GRADE NUMBER ACTIVITIES: OPERATIONS AND ALGEBRAIC THINKING
Represent and solve problems involving addition and subtraction
1.OA.A.1
Use addition and subtraction within 20 to solve 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: Change Unknown Word Problems
Take From: Change Unknown Word Problems
Bunk Bed Problem
Double Decker Bus Problem
Read Aloud Task Cards:
One Duck Stuck
The Very Hungry Caterpillar
One Hunter
Rooster's Off to See the World
Two of Everything
Mouse Count
Ten Flashing Fireflies
Also included in 1st Grade Math Centers:
** Add to: Result Unknown Word Problems (within 20)
** Add To: Start Unknown Word Problems (within 20)
** Take From: Result Unknown Word Problems (within 20)
** Take From: Start Unknown Word Problems (within 20)
** Put Together/Take Apart: Total Unknown Word Problems (within 20)
** Put Together/Take Apart: Both Addends Unknown (within 20)
** Put Together/Take Apart: Addend Unknown Word Problems (within 20)
** Compare: Difference Unknown Word Problems (within 20)
** Compare: Bigger Unknown Word Problems (within 20)
** Compare: Smaller Unknown Word Problems (within 20)
** Mixed Addition/Subtraction Word Problems (within 20)
1.OA.A.2 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.
Sample Activities:
Three Addends Word Problems
Find 3 Cards
Also included in 1st Grade Math Centers:
** Three Letter Addends
** Three Addends Problem Cards (all addends unknown)
Understand and apply properties of operations and the relationship between addition and subtraction
1.OA.B.3 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 of addition). 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 of addition).
Sample Activities:
Turn Around Trains
Turn Around Dominoes
Also included in 1st Grade Math Centers:
** Domino Fact Families
** Three Addends
1.OA.B.4 Understand subtraction as an unknownaddend problem. For example, subtract 108 by finding the number that makes 10 when
added to 8.
Sample Activities:
Subtract from 10
Also included in 1st Grade Math Centers:
** Ten Frame Subtraction
** Think Addition for Subtraction
Add and subtract within 20
1.OA.C.5 Relate counting to addition and subtraction (e.g. by counting on 2 to add 2).
Sample Activities:
Show One More
Show One Less
Also included in 1st Grade Math Centers:
** Count on Cover Up (ver.1)
** Count on Cover Up (ver. 2)
** Show One More/One Less
1.OA.C.6
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).
Sample Activities:
Count On One (ver. 1)
Count On One (ver. 2)
Count On Two (ver. 1)
Count On Three (ver. 1)
Doubles Cover Up (ver. 2)
Find Ten
Making Ten (ver. 1)
Four in a Row Subtraction
Domino Addition
Part Part Whole Cards
Also included in 1st Grade Math Centers:
** Count On Two (ver. 2)
** Count On Three (ver. 2)
** Count On Cover Up (within 10)
** Doubles Cover Up (ver. 1)
** Doubles Towers
** Doubles Path
** Doubles Concentration
** Cuisenaire Doubles
** Make 10 with Cuisenaire Rods
** Make Ten on the Ten Frame
** Towers of Ten
** Making Ten (ver. 2)
** Making Ten (ver. 3)
** Sums of Ten
** Doubles Plus One Towers
** Doubles Plus Two Towers
** Math Fact Sort (Set 1 & 2)
** Race to 50
** Addition Train
** Fact Family House
** Build a Cuisenaire House
** The Difference Game (ver. 13)
Work with addition and subtraction equations
1.OA.D.7 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
Sample Activities:
True or False?
Also included in 1st Grade Math Centers:
** Equal Sums
1.OA.D.8 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 = □
Sample Activities:
Find the Missing Number
1st GRADE NUMBER ACTIVITIES: NUMBER AND OPERATIONS IN BASE TEN
Extend the counting sequence
1.NBT.A.1 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.
Sample Activities:
Missing Number Grids 150
Also included in 1st Grade Math Centers:
** Counting Cards (Set 3)
** Ten Frame Path
** Base Ten Path
** Number Path
Understand place value
1.NBT.B.2
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).
Sample Activities:
Tens and Ones with Snap Cubes
Build a Train
Also included in 1st Grade Math Centers:
** Tens and Ones Game
** Representing Two Digit Numbers
** Base Ten Concentration (2 Digit)
** My Double TenFrame Riddle
1.NBT.B.3 Compare two twodigit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Sample Activities:
Comparing Two Digit Numbers
Scoop It
Also included in 1st Grade Math Centers:
** Ten Frame Compare
** Greater Than 50
** Who Has the Greater Sum? (ver. 1)
** Who Has the Greater Sum? (ver. 2)
Use place value understanding and properties of operations to add and subtract
1.NBT.C.4 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.
Sample Activities:
Sums of 90
Subtract 10 on the Number Line
Lucky Six
Adding a Multiple of 10 ver.1
Also included in 1st Grade Math Centers:
** Adding a 2Digit and One Digit Number
** Add Ten
** Adding Tens to a 2Digit Number
** Add Ten on the Number Line
** What Number is ...?
** Addition Split (2 digit + multiple of 10)
1.NBT.C.5 Given a twodigit number, mentally find 10 more or 10 less than the
number, without having to count; explain the reasoning used.
Sample Activities:
Ten More
Race Around (10) ver.1
Also included in 1st Grade Math Centers:
** Race Around (+ 10) ver. 1
1.NBT.C.6 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.
Sample Activities:
Subtract Ten
Subtract Multiples of Ten
More 1st Grade Number Resources