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Solving Decimal Equations by x / ÷ Lesson 3-6

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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”) 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

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

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

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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

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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

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

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

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