Subtraction patterns4th

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Subtraction patterns4th

  1. 1. © 2007 M. Tallman
  2. 2. The following pattern of subtraction is related to a basic math fact: 13 - 6 = 7 13 - 6 = 7 130 - 60 = 70 1300 - 600 = 700 13,000 - 6,000 = 7,000 130,000 - 60,000 = 70,0001,300,000 - 600,000 = 700,000 © 2007 M. Tallman
  3. 3. The following pattern of subtraction is related to a basic math fact: 15 - 7 = 8 15 - 7 = 8 150 - 70 = 80 1,500 - 700 = 800 15,000 - 7,000 = 8,000 150,000 - 70,000 = 80,0001,500,000 - 700,000 = 800,000 © 2007 M. Tallman
  4. 4. 1 2 1 2 1 2 500 - 400 = 100Step 1: Step 2: Step 3: Step 4:Find and “box” Find the How many Place the samethe basic difference of the zeros are in numbers of zerosmath fact. basic math fact. each number? in the difference. © 2007 M. Tallman
  5. 5. 1 2 3 1 2 3 12, 000 - 5,000 1 2 3 = 7,000Step 1: Step 2: Find Step 3: Step 4:Find and “box” the difference of How many Place the samethe basic the basic math zeros are in numbers of zerosmath fact. fact. each number? in the difference. © 2007 M. Tallman
  6. 6. 1 2 3 1 2 3 10,000 - 5,000 Tip Do not Tip:: Do not 1 2 3 = 5,000 count the count the zeros in the zeros in the basic math basic math fact. fact.Step 1: Step 2: Find Step 3: Step 4:Find and “box” the difference of How many Place the samethe basic the basic math zeros are in numbers of zerosmath fact. fact. each number? in the difference. © 2007 M. Tallman
  7. 7. 1 2 3 4 1 2 3 4 200,000 - 90,000 1 2 3 4 Tip Do not Tip:: Do not = 110000 , count the count the zeros in the zeros in the basic math basic math fact. fact.Step 1: Step 2: Find Step 3: Step 4:Find and “box” the difference of How many Place the samethe basic math the basic math zeros are in numbers of zerosfact. fact. each number? in the difference. © 2007 M. Tallman
  8. 8. Use what you know about subtraction patterns to solve for the unknown variable.14 - c = 8 c = 6e - 60 = 80 e = 1401,400 - 600 = u u = 80014,000 - v = 8,000 v = 6,000140,000 - 60,000 = w w = 80,000k - 600,000 = 800,000 k = 1,400,000 © 2007 M. Tallman
  9. 9. Use what you know about subtraction patterns to solve for the unknown variable.11 - 3 = d d = 8110 - f = 80 f = 30c - 300 = 800 c = 1,10011,000 - q = 8,000 q = 3,000110,000 - 30,000 = j j= 80,000m - 300,000 = 800,000 m = 1,100,000 © 2007 M. Tallman
  10. 10. Subtract mentally.1. 800 - 300 = 1. 5002. 900 - 500 = 2. 4003. 14,000 - 3. 9,000 5,000 =4. 900,000 - 4. 600,000 300,000 =5. 12,000 - 5. 7,000 5,000 =6. 700,000 - 6. 100,0007. 600,000 = 6,000 - 7. 2,000 4,000 = © 2007 M. Tallman

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