Real Numbers
This guide covers fundamental terms and concepts related to real numbers, including sets, subsets, and the definitions of rational and irrational numbers. Key mathematical ideas such as numerators, denominators, coefficients, and constants are explained, along with operations involving these concepts. Additionally, you'll learn the difference between rounding and truncating numbers, and the significance of the order of operations (PEMDAS) in simplifying expressions. This resource is ideal for students seeking to strengthen their understanding of real number properties.
Real Numbers
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Presentation Transcript
Real Numbers Section 0.1
TERMS you should know • Set – A group or collection of objects • Subset – A set of objects that are all members of another set • Ellipsis (…) – The pattern continues • Empty set 0 – A set with no elements • Numerator – Top of a fraction • Denominator – Bottom of a fraction • Constant – A known value • Variable – A letter representing some unknown value • Coefficient – A known value multiplied by a variable
Real Numbers Real Numbers Rational Numbers Irrational Numbers Whole Numbers Integers Natural Numbers
Same as 4.5 Terminates Rational Number Same as .777777777 Repeats Rational Number If it can be written as a ratio of integers it is Rational Same as 4.582575695… Doesn’t repeat or terminate Irrational Remember all rational and irrational numbers are real numbers Rational or Irrational???
Rounding or Truncating • Round 4.6769 to two decimal places • 4.68 • Truncate (cut off at) 4.6769 to two decimal places • 4.67
2 3 ( 10 – 3 · 2 ) + 30 – 5 2 = 3 ( 10 – 6 ) + 30 – 5 2 = 3 ( 4 ) + 30 – 5 Simplify using the order of operationsPEMDAS = 3 ( 4 ) + 30 – 25 = 12 + 30 – 25 = 42 – 25 = 17
Simplify using the order of operationsPEMDAS -3(2x + 4y) – (3x + 7y) -6x – 12y – 3x – 7y -9x – 19y
Evaluate the algebraic expressiona = 2, b = -3, c = -4 2a – 5b² 2(2) – 5(-3) ² 2(2) – 5(9) 4 – 45 -41
Absolute value- distance from zero |-2| =2 |-2+7| =|5| =5