Numbers and Operations in Base Ten (2b): Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

B. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

Quarter 1 (Continued in quarters 2 through 4)

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

B. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

This includes representing 100 with a "flat" base ten block (in quarters 2 - 4).

** Continue in quarters 2, 3, and 4 through routines and classroom discussion.

Enduring Understanding

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

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

1. Ten and Some More (VandeWalle, K-3, p 55). Use a simple two-part mat, and have children count out ten counters onto one side.
Next have them put five counters on the other side. Together count all of the counters by ones. Chorus the combination, "Ten and
five is fifteen." Turn the mat around, "Five and ten is fifteen." Repeat with other numbers in a random order but without changing the
10 side of that mat.

Rich Problems

Choose a number between 1 and 10. Show that number in as many ways as you can. Choose a number between 20 and 30. Show that number in as many ways as you can. (Small, Good Questions, Great Ways to Differentiate Mathematics Instruction, p 40).

Numbers and Operations in Base Ten (2b):Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:## B. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

## Quarter 1 (Continued in quarters 2 through 4)

B. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

This includes representing 100 with a "flat" base ten block (in quarters 2 - 4).

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

How does a digit's position affect its value?Essential Questions

Place Value, DigitVocabulary (online dictionary, HCPSS Vocabulary Cards)Rich Tasks for Multiple Means of Engagement, Expression, and Representation (UDL)Next have them put five counters on the other side. Together count all of the counters by ones. Chorus the combination, "Ten and

five is fifteen." Turn the mat around, "Five and ten is fifteen." Repeat with other numbers in a random order but without changing the

10 side of that mat.

Choose a number between 1 and 10. Show that number in as many ways as you can. Choose a number between 20 and 30. Show that number in as many ways as you can. (Small, Good Questions, Great Ways to Differentiate Mathematics Instruction, p 40).Rich ProblemsPrint Resources:Math by All Means Place Value 1-2

(56-71)

Math Connections K-3

(7, 32, 70)

Mental Math in the Primary Grades

(15-16)

Nimble with Numbers 1-2

(104)

Web ResourcesGames and CentersLessonsStudent ResourcesVideo SegmentsMy Double Ten-Frame Riddle

Teens on the Ten Frame

Make 10 Bundles

Base Ten Concentration (2 Digit)

Representing Two Digit Numbers with Base 10 Blocks

Printable GamesTens and Ones Game

Online Games

Zap

Hundred Board Logic

Guess My Number

Mystery Number (Game/Lesson Seed)

Instructional Ideas

Teaching Teen Numbers

Teen Number Instructional Idea

Interactive Hundred Chart

Base Ten Blocks

PrintablesHundred Chart

Teens on the Ten Frame Book Template

## Questions/Comments:

Contact John SanGiovanni at jsangiovanni@hcpss.org.Use and Sharing of HCPSS Website and Resources: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.