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I know how to add and subtract expressions
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Do Now: Write the additive inverse of each expression
x
3
­8
x + 3
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Do Now: Write the additive inverse of each expression
­y + 4
­17
x­8
2x ­ z
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Adding Expressions
Find the sum of 2x + 1 and 5x
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Dan likes to explain every step in his math problems. Write a
property or explanation next to each line
Original Given problem
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Find the sum of -3a + 2 and 5a -3
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Write an explanation of each step
original given problem
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Find the sum of (8a +2b -4) + (3b -5)
How do you know these
are equivalent?
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Find the sum of (-8a -b -4) and (-a -5)
How do you know these
are equivalent?
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sum of -5x + 2 and 11x - 7
(5 - 8y) + (-7y + 5)
Try
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x + 3y + 11 plus 5x -2y
Find the perimeter of the rectangle
3x + 1
x
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Subtracting Expressions
Subtract: (3x + 11) - (2x -4)
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Find the difference: (-3x + 7y -5) - (2x -4 + 8y)
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(3x -8) minus (-x +2)
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Find the difference between (5a -8b +1) and (4a -3b)
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(12p - q + 3r) subtracted from (18p + 5q -3r)
*
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*
(11 + 7x) less than (-5x + 4)
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(50x - 2y) - (3x -2y)
(12x + 18y)
- (7x + 10y)
Try
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3x subtracted from (3x + 11)
(x + 12) less than (-4x + 11)
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Marker Boards
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