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Unformatted text preview: work on the tens Rename: not enough tens to take away 3, so I need some more: 1 hundred=10 tens Basic Facts: : 12 3 = 9 Subtraction Algorithm for Whole Numbers Subtraction Algorithm for Whole Numbers 512 627 135 492 Place Value: start with ones Rename: not needed  there are enough ones to take away 5 Basic Facts: 7 5 = 2 Place Value : work on the tens Rename: not enough tens to take away 3, so I need some more: 1 hundred=10 tens Basic Facts: : 12 3 = 9 Place Value: hundreds Rename: not needed Basic Facts: 5  1 = 4...
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 Fall '11
 Kearn
 Subtraction

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