Integers.

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Presentation transcript:

Integers

Write the value of this real world example of integers 32 ○ F below zero A gain of 20 pounds Falling 62 feet 12○ C above zero Average attendance for church was down 38 people

Write a phrase of a real life example of an integer. temperature Depth in water elevation

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Absolute value bars and integers l -8 l l 42 l l -17 l Solve first then take absolute value! l 5 – 3 l l -8 – 4 l - l 9 – 3 l

Absolute value bars and integers Solve then take absolute value bars. l -56 + 9 l - l -8 – 10 l l 9 – 32 l

What to do with positive and negative #’s? Day 2 Integers What to do with positive and negative #’s?

Multiplying and Dividing Integers 1st Rule Same sign = positive 4 ● 3 = 12 or 12 ÷ 4= 3 -8 ● - 6 = 48 or - 48 ÷ - 8 = 6 Either way: two positives equal a positive answer or two negatives equal a positive answer 2 rules to learn

Multiplying and Dividing Integers 2nd Rule Different signs = negative 4 ● - 3 = - 12 -12 ÷ 4 = -3 -8 ● 6 = - 48 48 ÷ -8 = - 6 If one number in problem is negative then answer is negative 2 rules to learn

Multiply and divide integers - 9 ● 11= 36 ÷ 4 = - 6 ● 12 = 88 ÷ - 8 = - 3 ● - 7= - 24 ÷ 6 =

Adding integers- POWER UP -15 + 6 -16 + (- 14) 13 + ( -12) 34 + -17 =

Practice. -15 + 43 + -18 -16 + (- 14) + 49 13 + ( -12) + (-19) Adding integers Practice. -15 + 43 + -18 -16 + (- 14) + 49 13 + ( -12) + (-19)

Multiply and divide integers Work left to right. - 52 ÷ - 13 ● -2 = 3 ● - 8 ÷ 4 = -5 ● -9 ● 6 =

Adding and Subtracting Integers Day 3 Adding and Subtracting Integers Adding integers If #’s have same sign add and keep the sign. 7 + 2 = 9 -7 + -2 = -9 -100 + -50 = -150 2 rules to learn

Adding and Subtracting Integers Subtracting integers Use your calculator! No trick! You must subtract their absolute values then take sign of largest #. To subtract an integer, add the opposite. Adding and Subtracting Integers 2 rules to learn

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Subtracting integers -15 – 6 -16 - (- 14) 13 – ( -12) 34 – 17 =

Using the number line Try to solve these problems. Then check your work with your calculator. Pg. 97 #’s 1-5