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1st GRADE NUMBER ACTIVITIES: OPERATIONS AND ALGEBRAIC THINKING
Represent and solve problems involving addition and subtraction
1.OA.1
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.OA.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.
Possible Activities:
Three Addends Word Problems to 20
Find 3 Cards
Three Letter Addends
Understand and apply properties of operations and the relationship between addition and subtraction
1.OA.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) 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:
Turn Around Trains
Turn Around Dominoes
Domino Fact Families
1.OA.4 Understand subtraction as an unknownaddend problem. For example, subtract 108 by finding the number that makes 10 when
added to 8.
Add and subtract within 20
1.OA.5 Relate counting to addition and subtraction (e.g. by counting on 2 to add 2).
Possible Activities:
Show One More
Show One Less
One More/One Less Scoop
1.OA.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).
Possible Activities:
Dot Card Addition
Addition Domino Train
Plus One (ver. 1)
Plus One (ver. 2)
Doubles Towers
Doubles Path
Doubles Concentration
Cuisenaire Doubles
Find Ten
Ten Frame Fill
Make Ten
Work with addition and subtraction equations
1.OA.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
Possible Activities:
True or False?
Equal Sums
1.OA.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 = □
Possible Activities:
Find the Missing Number
1st GRADE NUMBER ACTIVITIES: NUMBER AND OPERATIONS IN BASE TEN
Extend the counting sequence
1.NBT.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.
Possible Activities:
Missing Number Grids 150
Understand place value
1.NBT.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).
1.NBT.3 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.NBT.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.
1.NBT.5 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.NBT.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.
Possible Activities:
Subtracting Sets of Ten
Subtracting Multiples of Ten
More 1st Grade Number Resources