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# 104 05 Integers Lesson

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Basic lesson on add, subtract, multiply, divide integers

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• 10/25/09 alg02_11 Bitsy Griffin
• ### 104 05 Integers Lesson

1. 1. Integers +, -, x, / Basics 10/25/09 Algebra 1.1 Bitsy Griffin
2. 2. Integers <ul><li>Whole numbers and their opposites. </li></ul><ul><li>Other vocabulary: </li></ul><ul><li>Opposites </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
3. 3. Essential Question: <ul><li>What is an integer? How does one work in a math sentence? </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
4. 4. Absolute Value <ul><li>Distance a # is from 0. </li></ul><ul><li>Always positive. </li></ul><ul><li>Read as: </li></ul><ul><li>The absolute value of . . . </li></ul><ul><li>|-6| </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
5. 5. Adding #’s w/same sign: <ul><li>Add absolute values and tack on the sign. </li></ul><ul><li>Adding #’s w/ op signs: </li></ul><ul><li>Find difference of absolute values </li></ul><ul><li>Take sign of number that “appears” larger </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
6. 6. subtracting #’s <ul><li>Add the opposite of the second # </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
7. 7. AV on Calculator <ul><li>2 nd 0 takes you to the catalogue. </li></ul><ul><li>abs is absolute value. </li></ul><ul><li>Hit enter. </li></ul><ul><li>Make sure you close the (). </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
8. 8. Multiply Positive Integers <ul><li>Multiply or Divide any number of terms </li></ul><ul><li>Answer is always positive </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
9. 9. X or / Mixed or Negative Integers <ul><li>Multiply or divide an even number of negative integers </li></ul><ul><li>Answer is always positive </li></ul><ul><ul><li>Multiply or divide an odd number of negative integers </li></ul></ul><ul><ul><li>Answer is always negative </li></ul></ul>10/25/09 Algebra 1.1 Bitsy Griffin
10. 10. Caution <ul><li>Watch out for negative integers raised to powers </li></ul><ul><li>-3^2 </li></ul><ul><li>(-3)^2 </li></ul><ul><li>-3^3 </li></ul><ul><li>(-3)^3 </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
11. 11. Essential Question: <ul><li>What is an integer? How does one work in a math sentence? </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin