Lesson Playlist: Subtracting by Counting Back: Numbers up to 20 Mathematics • Second Year of Primary School
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01:35Finding the Output of Subtraction Machines Testing Numbers up to 20
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02:30Relating Counting to Addition and Subtraction
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00:59Relating Counting Back to Subtraction Problems
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00:48Subtracting Two Numbers up to 99
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01:27Using the Counting Back Strategy to Subtract from Numbers up to 20
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01:26Subtracting a One-Digit Number from a Two-Digit Number
