The common-core math standards require that students learn the standard algorithm for multi-digit adding and subtracting—you know, the process in which you line the numbers up vertically to add or ...
Subtracting from two-digit numbers A lively dance accompanies children singing a song about subtraction. The song explains what subtraction is and demonstrates how to subtract 10 from a larger 10s ...
How to subtract tens from two-digit numbers Bill and Bernie use labelled balloons to show subtractions of 10 from several two-digit numbers which are less than 100. Bernie thinks of a number and Bill ...
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