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Published byAshlee Hutchinson Modified over 9 years ago
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Modified Jeopardy
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If you are playing with a partner, decide how many points you think the question is worth BEFORE you solve.
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True or False: 5 less than n =
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False: n less than 5
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Write an expression for five less than the product of a number n and 8
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8n -5
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True or False: n is an algebraic expression
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True! It has a coefficient (1) and a variable (n)
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Write an algebraic expression for: the quotient of the product of two and n and m
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2nm2nm
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Write a word expression for this:
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Answers vary! Sample: The quotient of six and three multiplied by the sum of six and three
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The FIRST step in evaluating an algebraic expression is called the _____________step
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The FIRST step in evaluating an algebraic expression is called the substitution step
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Evaluate when n = -3: 3n – (-7)
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3(-3) – (-7) (-9) + 7 -2
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Evaluate when n = -3 and r = -2: (nr) 2
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((-3)(-2)) 2 (6) 2 36
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Evaluate when n = -2 : (n – 3)(n – 4) ÷ (-3n)
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((-2) – 3)((-2) – 4) ÷ (-3(-2)) (– 6)(– 6) ÷ (6) (36) ÷ (6) 6
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Evaluate when n = -4 and p = 2: (3n + 9 - np) n + 2p
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(3(-4) + 9 - (-4)(2)) -4 + 2(2) (-12 + 9 - (-8)) 0 1 (Trick! Anything to exponent 0 is one )
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We solve equations by using these operations
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INVERSE operations
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n + (-7) = 8 What do you do to solve this?
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n + (-7) = 8 +7 +7 n = 15
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What do you do to solve this? -4n = -12
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-4 n = 3
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a – (-9) = -4 What do you do to solve this?
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a – (-9) = -4 -9 -9 a = -13
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Tell 3 things you could do to both sides of this equation to solve it: -x = 8
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Divide both sides by -1 OR Multiply both sides by -1 OR Add x then subtract 8 from both sides -x = 8
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– 3 + 2j = 4 What is the “wrapping paper”?
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– 3 + 2j = 4 The “wrapping paper” is -3. In other words, -3 is the FIRST term that you ‘cancel out’.
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-2b – 3 = -19 Solve
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-2b – 3 = -19 +3 +3 -2b = -16 -2 b = 8
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-8 – 3x= -17 Solve
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-8 – 3x= -17 +8 -3x = -9 -3 -3 x = 3
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1.2k – 6 = 6 Solve
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1.2k – 6 = 6 +6 +6 1.2k = 12 1.2 1.2 k = 10
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2(-3p + 6) = -18 Solve (hint: it’s 3 steps!)
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2(-3p + 6) = -18 2 2 -3p + 6 – 6 = -18 – 6 -3p = -24 -3 p = 8
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In most word problems “of” means what operation?
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In most word problems “of” means MULTIPLICATION
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Write an equation: 4 less than twice a number n is 6
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2m – 4 = 6
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Two-thirds of a number n, decreased by 3, is 12 2n/3 – 3 = 12
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The quotient of a number n and -8, less 5, is 25 n/(-8) – 5 = 25
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Write an equation then solve: Jim is 2 years less than twice his sister’s age. If Jim is 12 how old is his sister?
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2a – 2 = 12 -2 -2 2a = 12 2 a = 7
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