warm up 1)evaluate the expression: a) l5lb) l-13lc) – l0.56l 2)use mental math to solve the...

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1)1) Evaluate the expression:Evaluate the expression:

a) l5la) l5l b) l-13lb) l-13l c) – l0.56lc) – l0.56l

2)2) Use mental math to solve the equation:Use mental math to solve the equation:

a) lxl = -10a) lxl = -10 b) lxl = 2.7b) lxl = 2.7

3)3) Find the sum:Find the sum:

a) -6 + (-7)a) -6 + (-7) b) 4 + (-10)b) 4 + (-10)

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a) -6 + (-7)a) -6 + (-7) b) 4 + (-10)b) 4 + (-10)

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a) -6 + (-7)a) -6 + (-7) b) 4 + (-10)b) 4 + (-10)

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a) -6 + (-7)a) -6 + (-7) b) 4 + (-10)b) 4 + (-10)

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a) -6 + (-7)a) -6 + (-7) b) 4 + (-10)b) 4 + (-10)

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9/25/20129/25/20122.4 Subtracting Real 2.4 Subtracting Real

NumbersNumbers

GOALSubtract real numbers GOALSubtract real numbers using the subtraction ruleusing the subtraction rule

KEY WORDS: TermKEY WORDS: Term

Subtracting Real #sSubtracting Real #s

Some addition expressions can be evaluated using subtraction

ADDTION PROBLEM SUBTRACTION PROBLEM

5 + (-3) = 2 5 – 3 = 2

-2 + (-6) = -8 -2 – 6 = -8


To subtract To subtract b b from from aa, add the opposite , add the opposite of b to a.of b to a.

a – b = a + (-b)EXAMPLE: 3 – 5 = 3 + (-5)


EXAMPLESEXAMPLES

a. 10 – 11a. 10 – 11 b. 11 – 10b. 11 – 10

10 – 11 = 10 + (-11)

= -1

11 – 10 = 11 + (-10)

= 1


Expressions with more than one Expressions with more than one subtractionsubtraction

EX: EX: 4 – (-4) - 54 – (-4) - 5

4 – (-4) – 5 = 4 + 4 + (-5)8 + (-5)3

PRACTICEPRACTICEa.4 – 5

b. 0 – (-7)

c. -2 - 8

PRACTICEPRACTICE

d. 2 – (-3) – 6

e. -3 -2 – (-5)

warm up 1)evaluate the expression: a) l5lb) l-13lc) – l0.56l 2)use mental math to solve the...

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