Place value can be a difficult concept for little ones to grasp, especially the idea of grouping and regrouping ones into tens. For this reason, this product focuses on the numbers 10-99.
The activities included in this product are aligned to the following Texas Essential Knowledge Skills or TEKS(with modifications):
1.2 Number and operations. The student applies mathematical process standards to represent and compare whole numbers, the relative position and magnitude of whole numbers, and relationships within the numeration system related to place value. The student is expected to:
(B) use concrete and pictorial models to compose and decompose numbers up to 120 99 in more than one way as so many hundreds, so many tens, and so many ones;
(C) use objects, pictures, and expanded and standard forms to represent numbers up to 120 99;
(D) generate a number that is greater than or less than a given whole number up to 120 99;
(E) use place value to compare whole numbers up to 120 99 using comparative language;
(G) represent the comparison of two numbers to 100 99 using the symbols >, <, or =.

Activities:
Place Value Button Puzzles Center for numbers 11-20
Tens and Ones Center
Tens and Ones Bags Activity
Tens and Ones Fingers (Whole group activity or Center)
Tens and Ones Spin-a-Number Center
Detective Digit Center
Number Models Center
Comparing Numbers Center with leveled assessments and answer keys
Thirteen worksheets with answer keys.

Reference Materials
Number posters for numbers: 20, 30, 40, 50, 60, 70, 80, 90
Number Spelling cards for numbers: 10, 20, 30, 40, 50, 60, 70, 80, 90
How to write hyphenated numbers poster
Comparison symbols posters: greater than, less than, equal to