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Subtracting multi-digit numbers

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Intros
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Lessons
  1. Introduction to subtracting multi-digit numbers
  2. Regrouping technique: borrowing when there are zeroes
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Examples
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Lessons
  1. Subtracting 2-digit numbers with regrouping
    Subtract:
    1. 71 - 9
    2. 50 - 13
    3. 65 - 36
    4. 94 - 48
  2. Subtracting 3-digit numbers with regrouping
    Subtract:
    1. 468 - 281
    2. 812 - 223
    3. 950 - 671
  3. Subtracting from 100 or 1000
    Subtract:
    1. 100 - 68
    2. 100 - 49
    3. 1000 - 712
    4. 1000 - 543
  4. Subtracting 4-, 5- and 6- digit numbers with regrouping
    Subtract:
    1. 5431 - 2510
    2. 76820 - 34951
    3. 619687 - 418939
  5. Subtracting three numbers
    Subtract:
    1. 695 - 203 - 318
    2. 100 - 37 - 42
  6. Subtracting multi-digit numbers with regrouping: word problem
    Billy went to the electronics store with $2502. He bought a laptop for $1599. How much money does he have left?