Type a number, pick × or ÷, and pick a power of 10. Tap Next step to watch every digit move one place at a time. The decimal point stays put while the digits move.
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This link opens just this tool, with no menus or other pages, so students stay on task.
Teaching place value patterns? The Bridge the Gap place value workbooks start where each student is, from 1st grade skills up to 5th.