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Khan Academy
Khan Academy: Write Numbers in Written Form
Practice working with whole numbers in written form. For example, "one thousand four hundred three" is the written form of 1403. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...
NumberNut
Number Nut: Numbers and Counting: Numbers One Through One Hundred
For this activity, the player must read the number words up to one hundred, and click on the correct number symbol from four choices.
University of Cambridge
University of Cambridge: Nrich: Make 100
On this one page website sharpen your logic and problem solving skills while working on this challenge. The solution is available to double check your solution.