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MTH 116

MTH 116. A Review of Signed Numbers Sections 2.1, 2.2, and 2.3. Important!. This section is optional, and is only included for those students who need to review adding, subtracting, and multiplying signed numbers. Practice problems are found on pages 111-112, 113-114, and 116-117.

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MTH 116

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  1. MTH 116 A Review of Signed Numbers Sections 2.1, 2.2, and 2.3

  2. Important! • This section is optional, and is only included for those students who need to review adding, subtracting, and multiplying signed numbers. • Practice problems are found on pages 111-112, 113-114, and 116-117.

  3. Adding Signed Numbers • If you add two numbers with the same signs, keep the sign and add the numbers: POS + POS = POS NEG + NEG = NEG • If you add two numbers with different signs, subtract and take the sign of the greater number.

  4. Subtracting Signed Numbers • Every subtraction problem can be rewritten an addition problem: • KEEP the sign of the first number. • CHANGE the subtraction sign to an addition sign • CHANGE the sign of the second number. • Once you change the problem from subtraction to addition, refer to the rules for addition on the previous slide.

  5. Multiplying/Dividing Signed Numbers • If you multiply or divide two numbers with the same sign, the answer is positive: POS x POS = POS; POS / POS = POS NEG x NEG = POS; NEG / NEG = POS • If you multiply or divide two numbers with different signs, the answer is negative: POS x NEG = NEG; POS / NEG = NEG NEG x POS = NEG; NEG / POS = NEG

  6. Your Scientific Calculator • Look for a key that looks like this: (-) • Or this: +/- • (or something similar). • These keys are used to negate, or change the sign of a number. • Some calculators require the button to be pressed before the number, some after. Try yours to see which is which.

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