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# 106 Rationals Lesson

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Basic lesson on using TI83/4 with fractions

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• 10/25/09 alg02_13 Bitsy Griffin
• ### 106 Rationals Lesson

1. 1. Rational Numbers +, -, x, / 10/25/09 Algebra 1.1 Bitsy Griffin
2. 2. Essential question: <ul><li>What important facts do I need to know about fractions? </li></ul><ul><li>How do I order fractions? </li></ul><ul><li>How do I add, subtract, multiply, or divide numbers on the calculator? </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
3. 3. Vocabulary to Define <ul><li>Real Numbers </li></ul><ul><li>Rational Numbers </li></ul><ul><li>Irrational Numbers </li></ul><ul><li>Reciprocal </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
4. 4. Rational Numbers <ul><li>Any number that can be written as a ratio </li></ul><ul><li>Examples: </li></ul><ul><ul><li>5/9 </li></ul></ul><ul><ul><li>-2 </li></ul></ul><ul><ul><li>.75 </li></ul></ul><ul><ul><li>-√9 </li></ul></ul>10/25/09 Algebra 1.1 Bitsy Griffin
5. 5. Writing Fractions <ul><li>0/# is ok </li></ul><ul><li>#/0 NOT ok </li></ul><ul><li>Undefined </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
6. 6. Reciprocal <ul><li>Multiplicative inverse </li></ul><ul><li>Flip </li></ul><ul><li>Product of reciprocals is 1 </li></ul><ul><li>What’s the reciprocal of? </li></ul><ul><li>3/5 x ? = 1 </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
7. 7. Ordering Rational Numbers <ul><li>4 ¾ 3 2/9 3.11 </li></ul><ul><li>Find decimal equivalents </li></ul><ul><li>4.75 3.22 3.11 </li></ul><ul><li>Put the original #s in order </li></ul><ul><li>3.11 3 2/9 4 3/4 </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
8. 8. Calc Tips -> + Mixed #s <ul><li>When you have a fraction that looks like this: </li></ul><ul><li>Use the parentheses on your calculator like this: </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
9. 9. Calc Tips -> - Mixed #s <ul><li>When you have a fraction that looks like this: </li></ul><ul><li>Use the parentheses on your calculator like this: </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin
10. 10. Essential question: <ul><li>What important facts do I need to know about fractions? </li></ul><ul><li>How do I order fractions? </li></ul><ul><li>How do I add, subtract, multiply, or divide numbers on the calculator? </li></ul>10/25/09 Algebra 1.1 Bitsy Griffin