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Solving Decimal Equations by x / ÷

Solving Decimal Equations by x / ÷. Lesson 3-6. Basic Decimal Knowledge. Decimal represented by  . “Decimal places”  the digits that come AFTER the decimal To x / ÷ decimals  DO NOT line up decimals When a decimal is “out of sight”  only add one when dividing (“on the right”)

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Solving Decimal Equations by x / ÷

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  1. Solving Decimal Equations by x / ÷ Lesson 3-6

  2. Basic Decimal Knowledge Decimal represented by  . “Decimal places”  the digits that come AFTER the decimal To x / ÷ decimals  DO NOTline up decimals When a decimal is “out of sight”  only add one when dividing (“on the right”) When multiplying decimals  total decimal places in problem = total decimal places in answer! When dividing BY decimals  move bottom decimal to end of # = move top decimal same direction/same # of moves

  3. Solving Decimal Equations by x / ÷ Example: -81.81= -9n -9 -9 *divide into each digit AFTER decimal 9.09 = n

  4. Solving Decimal Equations by x / ÷ Example: 0.9r= -4.5 0.9 0.9 *move bottom decimal = move top decimal r= -6

  5. Solving Decimal Equations by x / ÷ Example: m = -12.5 -7 (-7) m = -12.5 (-7) -7 *total decimal places in problem = total decimal places in answer m = 87.5

  6. Solving Decimal Equations by +/- Example: s = 5.3 0.2 (0.2)s= 5.3 (0.2) 0.2 *total decimal places in problem = total decimal places in answer s= 1.06

  7. Practice Solve: a) -80 = t 4.5 b) 0.8x = -1.6 c) r = 0.5 -6.03 d) -2.4= -1.2c

  8. Homework p. 148-149 #20-24, 29, 39-41

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