Fun way to introduce the concept of addition
JPEG image - The numeracy wall - lots of helpful advice - counting in 5's and 10's, 2D and 3D shapes and more! ...
Geometry. Make your students do it themselves for those hands-on kinesthetic learners!
addition chain link
Here's a nice set of posters on equivalent fractions.
1 and 10 more and less using a 100 square
Australian Curriculum - ACMNA073 - Apply place value to partition, rearrange & regroup numbers to at least tens of thousands
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All About Abbie...: A Sneak Preview of My Classroom!