Integers



Recall:-8-1The 8 is negativeThe 1 is positive3 + (-9) The 3 is negative The 9 is also negative -2+5The 2 is positiveThe 5 is negativeEvaluate -2--1+-3+(+4)On Monday the price of a company’s stock is $25 per share. On Tuesday, the price drops $2, on Wednesday, it rises $6, on Thursday it rises $3, and on Friday it drops $4. What was the price at the end of the week?Multiplying or Dividing IntegersMultiply or divide the numbersThen determine their signs:++=--=+-=-+=(+)(+)=--=(+)(-)=-+=Why is negative times negative a positive?“He is not unintelligent.”Translation:“I’m not feeling bad.” Translation:“I cannot say that I do not disagree with you.” Translation:-Groucho MarxEvaluate.63-4-3-2-3-6-264-10(3)(-2)(10)(-5)-6-28. 10-29. -4411(-6) 10. -2-100-52If you multiply/divide an even number of negatives, you get a _____________.Example:If you multiply/divide an odd number of negatives you get a _____________.Example:9525038100You can NEVER divide by zero. It is undefined.Suppose 100 =x where x is a number.How do we deal with two mathematical signs next to each other?Simplifying two signs to one sign:Similarly if we have ×(+) we can just write it as × eg.3×(+7)= 3 X 7If we have ÷(+), we can write it as ÷eg.-8÷(+4)= -8 ÷ Whenever we have two signs next to each other that cannot be rewritten as one sign, we write the second one in brackets. Good Form: 6÷(-3) or 2×(-4)Bad Form! 6÷-3 or 2×-4The Number LineList the integers and graph them on a number line.x>2x>0x≤-2x≥-4x>4-10≤x ≤-7-2≤x ≤31<x<71≤x<7Evaluate.a) -2+-3-2+-4(-20) b) -6-2+(-3)(5)-(3)(-10)Homework: Integers Worksheet and Textbook pg. 5 # 4, 6 There are answers at the back of the textbook, ALWAYS CHECK them to make sure you’re on the right track! ................
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