# solving equations by adding or subtracting decimals

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Solving Equations by Adding or Subtracting Decimals. PRE-ALGEBRA LESSON 3-5. (For help, go to Skills Handbook page 730.). Simplify. 1. 2.8 + 7.06 2. 0.65 + 1.8 3. 4.52 2.48 4. 3.7 0.62. Check Skills Youll Need. 3-5. Solving Equations by Adding or Subtracting Decimals. - PowerPoint PPT Presentation

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• Solving Equations by Adding or Subtracting DecimalsPRE-ALGEBRA LESSON 3-5(For help, go to Skills Handbook page 730.)Simplify.

1.2.8 + 7.06 2.0.65 + 1.8 3.4.52 2.48 4.3.7 0.62 Check Skills Youll Need3-5

• Solving Equations by Adding or Subtracting DecimalsPRE-ALGEBRA LESSON 3-5Solutions1.2.802.0.65 + 7.06+ 1.809.862.45

3.4.524.3.70 2.48 0.622.043.083-5

• Solving Equations by Adding or Subtracting DecimalsSolve 6.8 + p = 9.7.PRE-ALGEBRA LESSON 3-56.8 + p = 9.7Quick Check3-5

• Solving Equations by Adding or Subtracting DecimalsPing has a board that is 14.5 ft long. She saws off a piece that is 8.75 ft long. Use the diagram below to find the length of the piece that is left.PRE-ALGEBRA LESSON 3-5The length of the piece that is left is 5.75 ft.x + 8.75 = 14.5Quick Check3-5

• Solving Equations by Adding or Subtracting DecimalsSolve 23.34 = q 16.99.PRE-ALGEBRA LESSON 3-523.34 = q 16.99Quick Check3-5

• Solving Equations by Adding or Subtracting DecimalsAlejandro wrote a check for \$49.98. His new account balance is \$169.45. What was his previous balance?PRE-ALGEBRA LESSON 3-5Alejandro had \$219.43 in his account before he wrote the check.p 49.98 = 169.45Quick Check3-5

• Solving Equations by Adding or Subtracting DecimalsPRE-ALGEBRA LESSON 3-5Solve each equation.

1.a + 10 = 7.9 2.1.01 = c 9

3.s (2.6) = 1.6 4.3.02 + d = 2.91

5.23.7 = 13.3 + g 37 2.17.99 1 0.113-5

• Solving Equations by Multiplying or Dividing DecimalsEvery day the school cafeteria uses about 85.8 gallons of milk. About how many days will it take for the cafeteria to use the 250 gallons in the refrigerator?PRE-ALGEBRA LESSON 3-63-6

• Solving Equations by Multiplying or Dividing Decimals(continued)PRE-ALGEBRA LESSON 3-685.8x = 250The school will take about 3 days to use 250 gallons of milk.Quick Check3-6

• Solving Equations by Multiplying or Dividing DecimalsSolve 37.5 = .PRE-ALGEBRA LESSON 3-6Quick Check3-6

• Solving Equations by Multiplying or Dividing DecimalsA little league player was at bat 15 times and had a batting average of 0.133 (rounded to the nearest thousandth). The batting average formula is a = , where a is the batting average, h is the number of hits, and n is the number of times at bat. Use the formula to find the number of hits she made.PRE-ALGEBRA LESSON 3-63-6

• Solving Equations by Multiplying or Dividing Decimals(continued)PRE-ALGEBRA LESSON 3-6The little league player made 2 hits.Quick Check3-6

• Solving Equations by Multiplying or Dividing DecimalsPRE-ALGEBRA LESSON 3-6Solve each equation.

1.9b = 30.6 2.10.8 =

3.2.45 = 0.7k 4. = 240

5.y (0.3) = 146.7 44.013.4273.5t3.78883-6