VIEWS: 12 PAGES: 25 POSTED ON: 2/16/2012 Public Domain
6-5 Multiplying and Dividing Decimals Objective: Multiply and divide decimals. 5-Minute Check 1. Name the multiplicative inverse of 12/5. 5-Minute Check 1. Name the multiplicative inverse of 12/5. 5/ 7 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ -4 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 3. n = 5/12 7/15 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 3. n = 5/12 7/15 25/ 28 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 3. n = 5/12 7/15 Evaluate each expression if m = 1/3 and n = -2/9 4. m/n 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 3. n = 5/12 7/15 Evaluate each expression if m = 1/3 and n = -2/9 4. m/n -1½ 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 3. n = 5/12 7/15 Evaluate each expression if m = 1/3 and n = -2/9 4. m/n 5. n/m2 5-Minute Check 1. Name the multiplicative inverse of 12/5. Estimate the solution to each equation. Then solve. Write the solution in simplest form. 2. x = -6 1½ 3. n = 5/12 7/15 Evaluate each expression if m = 1/3 and n = -2/9 4. m/n 5. n/m2 -2 6-5 Multiplying and Dividing Decimals When multiplying decimals, the number of decimal places in the product is the same as the sum of the decimal places in the factors. 6-5 Multiplying and Dividing Decimals Example 1 Solve y = (10.7)(0.13). 10.7 1 decimal place 6-5 Multiplying and Dividing Decimals Example 1 Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 6-5 Multiplying and Dividing Decimals Example 1 Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 6-5 Multiplying and Dividing Decimals Example 1 Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 1070 6-5 Multiplying and Dividing Decimals Example 1 Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 1070 1.391 3 decimal places 6-5 Multiplying and Dividing Decimals Example 1 Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 1070 1.391 3 decimal places y = 1.391 6-5 Multiplying and Dividing Decimals To divide decimals, multiply both the divisor and the dividend by a power of ten so that the divisor is a whole number. Then divide. 6-5 Multiplying and Dividing Decimals Example 2 Solve y = 2.25 2.5. 6-5 Multiplying and Dividing Decimals Example 2 Solve y = 2.25 2.5. Estimate: 2 2 = 1 2.5)2.25 6-5 Multiplying and Dividing Decimals Example 2 Solve y = 2.25 2.5. Estimate: 2 2 = 1 2.5)2.25 Multiply by 10 to get a whole number in the divisor. 6-5 Multiplying and Dividing Decimals Example 2 Solve y = 2.25 2.5. Estimate: 2 2 = 1 2.5)2.25 Multiply by 10 to get a whole number in the divisor. 0.9 25)22.5 Divide as with whole numbers. 225 6-5 Multiplying and Dividing Decimals Example 2 Solve y = 2.25 2.5. Estimate: 2 2 = 1 2.5)2.25 Multiply by 10 to get a whole number in the divisor. 0.9 25)22.5 Divide as with whole numbers. 225 x = 0.9 Compare to the estimate. 6-5 Multiplying and Dividing Decimals Assignment: 18 – 48 Even, 50 – 62 All. Page: 298+