Numbers and Operations in Base Ten (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.

Quarter 1
Quarter 2
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.

a. Count to 120 orally, starting at any number less than 120.

b. Read numerals up to 120.

c. Write numerals up to 120.
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.

d. Represent a number of objects up to 120 with a written numeral.

This includes representing 100 with a "flat" base ten block.
** Continue in quarters 3 and 4 through routines and classroom discussion.

Enduring Understanding
Katie Cubes
Digi Blocks
Base Ten Blocks

Understanding place value leads to number sense and efficient strategies for computation.

Essential Questions

How does a digit's position affect its value?

Vocabulary (online dictionary, HCPSS Vocabulary Cards)

Place Value, Digit

About the Math

Counting is a fundamental skill of mathematics. Students should be provided lots of opportunities throughout the day to practice counting. Objects of all kinds should be counted. To develop concepts of number, have students estimate how many of something before counting. For example, before getting crayons have students estimate how many crayons are in the box. After estimating, partners should count to find a total. When students are first estimating, ask them if the amount is more than ten or less than ten, or more than 20 less than 20, etc. This helps them begin to get a sense of quantity.hundred_chart.png

Illustrative Mathematics Project Examples

Hundred Chart Digit Game, Choral Counting II, Start/Stop Counting II, Crossing the Decade Concentration

Rich Tasks for Multiple Means of Engagement, Expression, and Representation (UDL)

1. Show clear jars with different amount of objects (i.e. a jar of linking cubes, jelly beans, paper clips, etc). Have students identify which jars they think have the most objects. Have students share their reasoning. Have groups/partners count the objects in each jar, write the number, and write the amount on a sticky note that can be placed on a number line. Have the class share their findings.

2. An estimation jar can be part of a weekly routine. Use a quart jar and place objects in the jar. Ask students to estimate the number of objects. Once estimates have been given, count the number of objects. Record the number on a chart. This chart should be displayed. The next week put different objects in the jar that are larger or smaller than the first set of objects. The number of objects from the weeks before, can help students estimate the new number of objects. For instance, if there are 35 unifix cubes the first week and the following week there are centimeter cubes which are smaller. Elicit from the students there are more centimeter cubes because they are smaller than the unifix cubes.

Important Tools/Models

  • Hundreds charts and number lines are important tools for understanding counting principles as well as concepts of number. Students should be exposed to and use both tools frequently.NumberLine.png
  • A large hundreds chart should be displayed in the room for all students to see. Students should be encouraged to refer to the chart.
  • Groupable models: Beans and a small cup for 10 beans, Linking cubes, Plastic chain links
  • Pregrouped materials: Strips (ten connected squares) and squares Base-ten blocks, Beans and beans sticks (10 beans glued on a craft stick), Ten-frame
  • Place value mat, or chart graph paper with numbers from 1 to 120 in rows

Print Resources

Brain Compatible Activities for Mathematics K-1 (12-13)
Roads to Reasoning (Grade 1):
Class Pets (30-33), How Many? (6-7)
On the Farm (8-9), Pool Party (76-79)
Developing Mathematics with Unifix Cubes:
Three Cubes on your Fingers (46-47)
Math Intervention: Building Number Power K-2
(20-30; 100-103)

Web Resources

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Games and Centers
Student Resources
Video Segments
Printable GameFish Out of Water - Center Ideas
Counting Activities
Lesson Seeds


Count Around
Missing Numbers Grids 1-50

Online Resource
Interactive Hundreds Chart

Student Activity IdeasFun Counting Activities

Animals and Numbers: Counting Forwards and Backwards
How to Count On
Online GamesGrouping and Grazing
The Counting Game

Ten Frame

Five Frame

Okta's Rescue

Guess My Number

Give the Dog a Bone

Whack A Mole

Lesson Plans
Curious George Counts to 100

Mystery Number (Game/Lesson Seed)

Fill in the Hundreds Chart Race

Illustrative Mathematics Examples
Hundred Chart Digit Game
Choral Counting II
Start/Stop Counting II
Crossing the Decade Concentration

(Dalton Onorato, Cradlerock)
See Teacher Share page for ideas for this resource.

Hundred Chart Spin

Connecting Children's Literature:

Click on the books for additional activities.
Counting Crocodiles
by Judy Sierra
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100 Days of Cool Activities
Math Fablesby Greg Tang


Contact John SanGiovanni at

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Howard County Public Schools Office of Elementary Mathematics Curricular Projects has licensed this product under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.