999 West Dundee Road
Wheeling, Illinois 60090

Phone: 847-537-8270

Superintendent: Dr. Michael Connolly

School Board & Administration



CCSD21 is a school district comprised of 13 schools across 6 different communities in the northwest suburbs of Chicago.



School District 21 prides itself on its Professional Learning Community and its rich tradition of professional collaboration, high levels of professional development, and family-like atmosphere. If you see the opportunity to work with colleagues in making a difference in the lives of students and families in a truly diverse setting, School District 21 seeks your application.

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Number and Operations in Base Ten

Critical Content

Power Standards

  • Use place value understanding to identify the three digits of a three-digit number as the amount of hundreds, tens, and ones. (2.NBT.1)


Concepts and Skills

* Power Standard Content

  • *Understand place value to hundreds
  • Read and write numbers to 1000 or more using base-ten numerals, number names and expanded form
  • Compare three-digit numbers; record using symbols (<, =, >)
  • Count/skip-count by 1s, 2s, 5s, 25s, and 100s past 1,000
  • Count back by 1s, 10s, and 100s from any number less than 1,000
  • Mentally add or subtract 10 or 100 to / from any given number
  • Use efficient strategies to fluently add and subtract within 100
  • Add and subtract within 1000 using models, drawings, and other strategies


Critical Language

Language Usage

  • A student in 2nd grade can demonstrate the ability to apply and comprehend critical language by explaining place value up to the hundreds place, the relationship between the hundreds, tens, and ones places, and by using place value to explain why addition and subtraction strategies work.


Content-Specific Vocabulary

  • Digit
  • Place value
  • Hundreds
  • Tens
  • Ones
  • Add
  • Subtract
  • Sum
  • Total
  • Difference
  • Addend
  • Plus
  • Minus
  • Expanded form


Process-Specific Vocabulary

  • Count
  • Skip-count
  • Compare
  • Greater than
  • Less than
  • Equal
  • Solve
  • Strategy
  • Model


Concept-Based Connections

Essential Understandings

  • Location of digits determines their value.
  • Identifying the repetition in a pattern allows the pattern to be described by a rule.


Factual Guiding Questions

  • How can you compare two sets of numbers?
  • What patterns exist in numbers?
  • What real life situations require us to add and subtract?


Conceptual Guiding Questions

  • How does knowing place value help to perform computations?
  • What is the relationship between the value of a digit and the values of the digits on either side of it?
  • Why do we compare numbers?


Engaging/Debatable Guiding Questions

  • How would the world be different without place value?