Ten Frame reference chart
Ordinal Numbers
place value
place value
Different ways to make 21
Number Sense
100 chart
Large Numbers
Here's a nice chart for thinking about different ways to represent a number. Draw-Write-Symbolize recording sheet for students included.
Number Poster
All About the number ___
A Tally Tale
First grade "number sense" anchor chart...
Place Value
ways to show a number
ideas for displays
number anchor charts
Place value anchor chart
All About the Number 11-20 Anchor Chart