Curriculum Guide
Grade 1 – Math Standard 1.2
Math 1.2 - Number relationships can be used to solve addition and subtraction problems.
Related Colorado Department of Education Sample Units:
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Is It A Ten Or A One (Concepts: Addition, subtraction, unknown quantity, join (combine/compose), separate (take away/decompose),
compare (difference), place value, digit, tens, ones, unitizing, model, symbols, comparison)
What’s Faster Than Counting? (Concepts: Addition, subtraction, commutative, associative, identity, efficiency, inverse, counting on, counting
back, counting all, unknown, addend, equation, strategies, tens, ones, making ten, equal, equivalent)
Essential Questions - 21st Century Skills and Readiness Competencies (District):
*1. How can you represent addition and subtraction problems with base ten blocks and
objects?
2. How can you use addition and subtraction to solve word problems?
3. What do you do when you have three addends?
4. What happens when you switch the addends in an addition problem?
*5. How can you use subtraction to solve for an unknown addend?
6. How is adding and subtracting like counting? How is it different?
*7. What are some strategies you can use to solve addition and subtraction problems?
*8. Can you demonstrate that you know how to add and subtract within 20 fluently?
*9. How can you use symbols to show equal amounts?
*10. If you have a missing number, how can you use addition and subtraction to find
out what it is?
Evidence Outcomes (District):
1. Represent and solve problems involving addition and subtraction.
2. Use addition and subtraction within 20 to solve word problems.
3. Solve word problems that call for addition of three whole numbers whose sum is less
than or equal to 20.
4. Apply properties of operations and the relationship between addition and
subtraction.
5. Relate subtraction to unknown-addend problem.
6. Add and subtract within 20 and relate that counting to addition and subtraction.
7. Add and subtract within 20 using multiple strategies.
8. Demonstrate fluency for addition and subtraction within 20.
9. Use the equal sign to demonstrate equality in number relationships.
10. Determine the unknown whole number in an addition or subtraction equation
relating three whole numbers.
*Meets embedded requirements for Standard 2.
Academic Vocabulary (District):
addition
subtraction
addends
sum
difference
+ (plus)
= (equal)
- (minus)
properties of operations
relationship between
multiple strategies
word problems
whole number
Assessment (District):
1a. Teacher checks accuracy of Number Concept Bag Worksheet.
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1a. Concept Bag Addition Assessment
1b-d. Use "All Aboard" on p.10 of "Math Facts Assessment" to assess addition of basic
math facts.
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1b-d. Math Facts Assessment – copyright material see:
http://www.origostore.com/The-Box-of-Facts-Book-of-Facts-Set-Addition-and-Sp/bas%20set.htm
Counting On Addition Activities -view sample activity
1e. Use Unifix Record Sheet Assessment.
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1e. Unifix Cubes Record Sheet see: http://www.hubbardscupboard.org/
3: Use worksheet on the Adding Three Addends attachment to assess student's ability
to add three addends.
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3. Adding Three Addends Assessment
4: Use Fact Family Map Rubric to assess understanding of fact families.
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4b. Fact Family Map Rubric see: http://childrensengineering.org/
5. Use Missing Addends Assessment.
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5. Missing Addends Assessment
6a. Use p. 11 on "Counting On" to assess student's ability to count on one and two to
achieve a new sum.
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6a. Counting On Assessment - copyright material see:
http://www.origostore.com/The-Box-of-Facts-Book-of-Facts-Set-Addition-and-Sp/bas%20set.htm
6a. Counting On Addition Activities -view sample activity
7a. Teacher Observation: Assess for accuracy as students manipulate the number line
using a slider bag.
8. Teacher Observation: Evaluate the accuracy of the equation on the flower.
9. Teacher Observation: Evaluate the accuracy of number sentences.
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9. Twin Buddies Assessment
10. Evaluate student's ability to use ten frames to solve for unknown in addition and
subtraction.
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Suggested Activities/Strategies (District):
1a. Do the Addition Concept Bag Activity. Using objects and number cards, students
will model basic addition facts with sums of 0-20. (See attachment.)
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1a. Addition Number Concept Bag Instructions
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1a. Addition Bag Activity Cards 4-9
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1a. Addition Bag Activity Cards 11-19
1b. Students will play an addition and subtraction game to practice basic facts 0-10.
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1b. Addition and Subtraction Equations Game Instructions and Making Cards
1c. Use the Fact Family Hanger Activity. Using clothes pins, students will slide the pins
side to side to model different combinations and to arrive at the sum indicated on the
card place at the hook of the hanger. (See attachment.)
1d. Use Dominoes to demonstrate math addition facts.
1e. Use Unifix Cubes to demonstrate addition facts listed on flash cards. (See
attachment for illustration.)
2. Use the problem solving poster to teach students word problem solving strategies.
Practice using the strategies to solve problems.
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2. Problem Solving Poster
3. By creating a poster of a rainbow, students will visualize the combinations to make
sums of ten, and then use mental math to add three addends.
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3. Adding Three Addends Instructions
4a. Use the Fact Family Triangles. Create fact families.
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4a. Fact Family Triangles
4b. Use the Fact Family Map Activity. Students create a house and community based
on fact families. (See attachment.)
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4b. Fact Family Map - see: http://childrensengineering.org/
5. Use "Out of Sight Missing Addends" Lesson to teach the relationship between addition
and subtraction.
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5. Out of Sight Missing Addends
6a. Use the "Count On" Strategy Activities on pgs. 2-9, (Total Bingo & Super Spokes)
to practice "counting on" as an addition strategy.
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6a. Counting On Addition Activities -view sample activity
7a. Using Ziploc slider bags to create number lines, students will model addition and
subtractions problems by moving the slider forward and backwards. (See
attachment for detailed instructions.)
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7a. Ziploc Slider Number Lines
*7b. Use the Making Equations Activity to practice creating complete addition and
subtraction number sentences.
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7b. Making Equations Activity Directions – download Making Equations game
8. Use the Fun Fact Flower Activity to demonstrate the ability to make several
equations that equal the same sum.
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8. Fun Fact Flower
*9a. Use the Twin Buddies Activity. Practice dividing totals into different sets to create
a variety of number sentences.
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9. Twin Buddies Activity
*9b. Play Money Partners. Separate total coins into different sets to create a variety of
number sentences. Record number sentences.
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9b. Money Partners Activity
9b. Money Partners Worksheet
*10. Use ten frames to solve for unknown numerals in an addition and subtraction
problem.
 10. Blank Ten Frame See: http://www.k-5mathteachingresources.com/1stgrade-number-activities.html
Resources/Technology (District):
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
Math Literature Resource List
http://www.hubbardscupboard.org/math.html
*Meets embedded requirements for Standard 2.