This set of reproducible dominoes would make a great station.
This would be a good site to use at a center with money manipulatives.
This site is awesome for teaching symmetry. It combines video real world examples with interactive questions.
Maths Dictionary for Kids
This site is a great precurser to comparing and ordering numbers in the thousands. Watch as ones are added and grow to a thousand. It's a great chance to stress the X 10 concept that is at the root of our place value system.
This is a great quiz that tests kids' ability to count lines of symmetry. Some may need to have the foldable shapes to manipulate as they work.
This is a great practice site for one or more lines of symmetry. Use it with your floating tools so that kids can draw the lines, and consider providing cut out shapes for folding. It's not self checking, but it is printable if you want to check independent work.
This site is great for demonstrating lines of symmetry. Graphics are fabulous, and the kids can actually watch the shapes fold. Interactive practice is provided throughout.
This is a great site for helping kids understand figures with multiple lines of symmetry.