© 2007 M. Tallman

130, ,000 = 70,000 The following pattern of subtraction is related to a basic math fact: = = = , ,000 = 7, = 7 1,300, ,000 = 700,000

© 2007 M. Tallman 150, ,000 = 80,000 The following pattern of subtraction is related to a basic math fact: = = 80 1, = , ,000 = 8, = 8 1,500, ,000 = 800,000

© 2007 M. Tallman 4 5 Step 1: Find and “box” the basic math fact. Step 2: Find the difference of the basic math fact. Step 3: How many zeros are in each number? Step 4: Place the same numbers of zeros in the difference. 1 00=

0005, 12, 7 = , Step 1: Find and “box” the basic math fact. Step 2: Find the difference of the basic math fact. Step 3: How many zeros are in each number? Step 4: Place the same numbers of zeros in the difference

© 2007 M. Tallman , 10, 5 = -000 Step 1: Find and “box” the basic math fact. Step 2: Find the difference of the basic math fact. Step 3: How many zeros are in each number? Step 4: Place the same numbers of zeros in the difference., Tip: Do not count the zeros in the basic math fact

© 2007 M. Tallman , = -0,000 Step 1: Find and “box” the basic math fact. Step 2: Find the difference of the basic math fact. Step 3: How many zeros are in each number? Step 4: Place the same numbers of zeros in the difference., Tip: Do not count the zeros in the basic math fact

© 2007 M. Tallman 140, ,000 = w Use what you know about subtraction patterns to solve for the unknown variable. e - 60 = 80 1, = u 14,000 - v = 8, c = 8 k - 600,000 = 800,000 c = 6 e = 140 u = 800 v = 6,000 w = 80,000 k = 1,400,000

© 2007 M. Tallman 110, ,000 = j Use what you know about subtraction patterns to solve for the unknown variable f = 80 c = ,000 - q = 8, = d m - 300,000 = 800,000 d = 8 f = 30 c = 1,100 q = 3,000 j= 80,000 m = 1,100,000

© 2007 M. Tallman Subtract mentally = = 3.14, ,000 = 4.900, ,000 = 5.12, ,000 = 6.700, ,000 = 7.6, ,000 = , , , , ,000