Lesson: Bridge Method
 The Bridge Method a method of converting units using cancellationThe Bridge Method to use the bridge method... to use the bridge method...you have to have... to use the bridge method...you have to have...Unit Conversion Factors to use the bridge method...you have to have...Unit Conversion FactorsLike these1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft You also have to have something to be converted1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLike thisYou also have to have something to be converted1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft Conversion problem?5 ft = _____ inWhich is which?Unit conversion Factors?1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method1. Draw the bridge1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method1. Draw the bridgethe bridge will look like a 'plus' sign1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method1. Draw the bridgethe bridge will look like a 'plus' signLike this1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method2. Write the given information in the bridge1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method2. Write the given information in the bridge5 ftalways put it in the top leftRight here1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method3. Find the unit conversion factor you need5 ft1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method3. Find the unit conversion factor you need5 ftyou need one that has the given unit1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method3. Find the unit conversion factor you need5 ftyou need one that has the given unitthe given unit is feet1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method3. Find the unit conversion factor you need5 ftyou need one that has the given unitthere are 2 unit conversion factor with feet1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method3. Find the unit conversion factor you need5 ftyou need one that has the given unitbut since we are converting to inches we will use the one with inches1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridge5 ft1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ftThe factor will be written in the secondcolumn1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ftit can either be writtenlike this1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft12 in1 ftit can either be writtenlike this1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft12 in1 ftor like this1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft1 ft12 inor like this1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft1 ft12 inbut the units mustcancel1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft1 ft12 inbut the units mustcancel1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft1 ft12 inbut the units mustcancel1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft Since feet is in the top5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgebe sure that the units cancel5 ft1 ft12 inbut the units mustcancel1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method4. Write the unit conversion factor in the bridgeFeet must also be in the bottombe sure that the units cancel5 ft1 ft12 inbut the units mustcancel1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method5. Cancel the units5 ft1 ft12 in1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method5. Cancel the units5 ft1 ft12 in1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method5. Cancel the units5 ft1 ft12 in1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge method6. Then do that math5 ft1 ft12 in1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge methodMultiply numbers in the top, divide bottom numbers6. Then do that math5 ft1 ft12 in1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge methodMultiply numbers in the top, divide bottom numbers6. Then do that math5 ft1 ft12 in51 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge methodMultiply numbers in the top, divide bottom numbers6. Then do that math5 ft1 ft12 in5 x 121 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge methodMultiply numbers in the top, divide bottom numbers6. Then do that math5 ft1 ft12 in5 x 12 ÷ 11 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge methodMultiply numbers in the top, divide bottom numbers6. Then do that math5 ft1 ft12 in5 x 12 ÷ 1 = 601 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft = _____ inLet's go through the steps of the bridge methodThe answer is 60!5 ft1 ft12 in5 x 12 ÷ 1 = 601 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 5 ft =   60  inLet's go through the steps of the bridge methodThe answer is 60!5 ft1 ft12 in5 x 12 ÷ 1 = 601 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft Let's try another one!!!1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft1. Draw bridge1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft1. Draw bridge1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft1. Draw bridge2. Write problem1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in1. Draw bridge2. Write problem1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in1. Draw bridge2. Write problem3. Find conversion1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in1. Draw bridge2. Write problem3. Find conversion1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in1. Draw bridge2. Write problem3. Find conversion4. Write conversion1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in12 in1 ft1. Draw bridge2. Write problem3. Find conversion4. Write conversion1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in12 in1 ft1. Draw bridge2. Write problem3. Find conversion4. Write conversion5. Cancel units1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in12 in1 ft1. Draw bridge2. Write problem3. Find conversion4. Write conversion5. Cancel units1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 in12 in1 ft1. Draw bridge2. Write problem3. Find conversion4. Write conversion5. Cancel units6. Do math1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft 30 in = _____ ft30 x 1 ÷ 12 = 2.530 in12 in1 ft1. Draw bridge2. Write problem3. Find conversion4. Write conversion5. Cancel units6. Do math1 ft = 12 in3 ft = 1 yd1 mi = 5,280 ft What are the steps to the bridge method What are the steps to the bridge method1.2.3.4.5.6.7.Cancel Units?Find Conversion?Write Conversion?Draw Bridge?Write Problem?Do Math? 2.3 ft = ? in2.3 ft?12 in?1 ft? 0.78 mi = ? km0.78 mi?1.61 km?1 mi? 17 in = ? mm17 in?2.54 cm?1 in?10 mm?1 cm? 200 mm = ? cm200 mm?1 cm?10  mm? 30 in = ? yd30 in?1 ft?12 in?1 yd?3 ft? 2500 mm = ? km2500mm?1000 mm?1 m?1 km?1000 m?
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