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Mathematical subtraction patterns and mental subtraction skills
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Mathematical subtraction patterns and mental subtraction skills
1.
© 2007 M.
Tallman
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 = 70,000 1,300,000 - 600,000 = 700,000 © 2007 M. Tallman
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 = 80,000 1,500,000 - 700,000 = 800,000 © 2007 M. Tallman
4.
1 2
1 2 1 2 500 - 400 = 100 Step 1: Step 2: Step 3: Step 4: Find and “box” Find the How many Place the same the basic difference of the zeros are in numbers of zeros math fact. basic math fact. each number? in the difference. © 2007 M. Tallman
5.
1 2 3
1 2 3 12, 000 - 5,000 1 2 3 = 7,000 Step 1: Step 2: Find Step 3: Step 4: Find and “box” the difference of How many Place the same the basic the basic math zeros are in numbers of zeros math fact. fact. each number? in the difference. © 2007 M. Tallman
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 same the basic the basic math zeros are in numbers of zeros math fact. fact. each number? in the difference. © 2007 M. Tallman
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 same the basic math the basic math zeros are in numbers of zeros fact. fact. each number? in the difference. © 2007 M. Tallman
8.
Use what you
know about subtraction patterns to solve for the unknown variable. 14 - c = 8 c = 6 e - 60 = 80 e = 140 1,400 - 600 = u u = 800 14,000 - v = 8,000 v = 6,000 140,000 - 60,000 = w w = 80,000 k - 600,000 = 800,000 k = 1,400,000 © 2007 M. Tallman
9.
Use what you
know about subtraction patterns to solve for the unknown variable. 11 - 3 = d d = 8 110 - f = 80 f = 30 c - 300 = 800 c = 1,100 11,000 - q = 8,000 q = 3,000 110,000 - 30,000 = j j= 80,000 m - 300,000 = 800,000 m = 1,100,000 © 2007 M. Tallman
10.
Subtract mentally. 1.
800 - 300 = 1. 500 2. 900 - 500 = 2. 400 3. 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. 100,000 7. 600,000 = 6,000 - 7. 2,000 4,000 = © 2007 M. Tallman
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