Math Kindergarten Unit 3
Building and Comparing
Numbers
“I Can” Help My Student
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I can I can write numbers from 0 to 20
I can write a number for a group of 0 to 20 objects.
I can name a group of objects by using a number.
I can understand that the last object counted tells the
numbers of objects in a group.
I can understand that the number of objects in a group can
be rearranged and the total number will be the same.
I can understand that adding an object to a group will
make the total number ONE bigger.
I can count to tell how many.
I can count out a number of objects between 1 and 20.
Key Words to Know
Compose- To put together basic elements. (e.g., Numbers or
geometric shapes.)
Decompose- To separate into basic elements. (e.g., Numbers or
geometric shapes.)
Digit- Any of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
Greater than- Greater than is used to compare two numbers when
the first number is larger than the second number. (Symbols are
not used in Kindergarten.)
Less than- Less than is used to compare two numbers when the
first number is smaller than the second number. (Symbols are
not used in Kindergarten.)
Match- One-to-one correspondence.
More- Greater quantity or amount.
Number pair- A set of two numbers. (e.g., 1 and 4 are number
pairs because together they make another number.)
Parent Guide
What your student should know & do at home
Important Understandings and Concepts
What should my student already know before I begin…..
• be able to begin to count by ones and tens to 100 (rote count)
• be able to subitize (instantly recognize quantities up to 5)
• be able to write numbers from 0 to 20 and represent numbers with objects
• be able to continue count sequence when beginning from a number greater than •
• be able to understand one to one correspondence
• be able to identify a number quantity for numerals and words
• be able to represent numbers with numerals, pictures and words
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Learning at a Glance
Students will have many opportunities to count and create sets (objects, people, drawings,
etc.). The students will experience composing and decomposing numbers from 11 to 19 into
ten ones and some further ones by writing and representing the numbers, counting and
producing sets of given sizes, counting the number of objects in combined sets, or counting
the number of objects that remain in a set after some are taken away.
10 + 1 = 11
is the same as 10 ones and 1 more one
10 + 3 = 13
is the same as 1 ten and 3 ones
The terms students should continue to use as they verbalize thinking are: join, add,
separate, subtract, same amount as, equal, less, more, tens, & ones.
Math Kindergarten Unit 3
Building and Comparing
Numbers
Sample Problems
Building a teen number - Students will work to ‘make’ their own group of ten.
Give the student 20 straws, two twist ties or rubber bands, pencil, and paper.
Have the student choose and write a number from eleven to nineteen and take
that many straws. Have them count out and make one bundle of ten using the
twist tie, then write and draw what they have. For example: 12 is the same
as ten and two
Have them unbundle and return their sticks to the pile then repeat with
another teen number.
Parent Guide
What your student should know & do at home
How Can You Help Your Student?
Interactive Learning Lessons
Your student can watch the videos alone or with you. Have your student take notes
while watching. Allow them to watch as many times as needed.
• http://www.youtube.com/watch?v=pxyde-OxerA
Math Teen number song
• http://www.youtube.com/watch?v=l1D6HxJECzs
Reading and Writing the Teen Numbers
Interactive Learning Games
Writing a number sentence- Sue has 16 teddy bears. Draw a picture to
represent the number 16. Circle the group of 10. Write an equation
representing your picture.
____ +____ = ____
Task 3. Teen Frame Talk About- Give the student a pile of counters in two
colors; with at least 10 cubes of each color. Ask students to build a set of a two
teen numbers and then describe and compare the sets. (As the students are
completing this task, ask this questions: What is an efficient way to count an
amount greater than ten?)
Playing games is a wonderful way to practice skills at home in a fun environment. Stackn-Pack books contain several math games covering math concepts from Kindergarten
through High School. Stack-n-Pack card games may be checked out from your school
(contact your school’s Parent Liaison) or purchased online: Stack-n-Pack Mathematics
Card Games for K-HS .
Stack-n-Pack Grades PreK-2
All Numbers to 20 game
Recommended Children’s Literature
Use these books to enhance both language literacy and mathematical literacy.
These books can be checked out at your local Atlanta-Fulton Public Library
System. www.afplweb.com
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Anno’s Counting Book by Mitsumasa Anno
Monster Munches By Laura Numeroff (oral readings on
YouTube.com)
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http://illuminations.nctm.org/Activity.aspx?id=3565
Interactive lesson for building numbers
http://www.abcya.com/counting_fish.htm
Counting game