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# 2 25 Adding Subtracting Mixed Numbers

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### 2 25 Adding Subtracting Mixed Numbers

1. 1. Adding & Subtracting Mixed Numbers<br />12/10/09<br />EQ: How do I add or subtract mixed numbers?<br />12/9/2009<br />1<br />Bitsy Griffin Lessons 2-24 & 25<br />
2. 2. Review:<br />How do you add fractions with the same denominator?<br />12/9/2009<br />2<br />Bitsy Griffin Lessons 2-24 & 25<br />
3. 3. Review:<br />How do you add fractions with the different denominators?<br />12/9/2009<br />3<br />Bitsy Griffin Lessons 2-24 & 25<br />
4. 4. Review:<br />How do you simplify a fraction?<br />12/9/2009<br />4<br />Bitsy Griffin Lessons 2-24 & 25<br />
5. 5. Suggestions:<br />Estimate approximate answer<br />+ / - fractions.<br />Denominators unlike?<br />12/9/2009<br />5<br />Bitsy Griffin Lessons 2-24 & 25<br />
6. 6. Suggestions:<br />Simplify the fraction.<br />you may end up with a fraction &gt; 1<br />In subtraction, you may have to rename!<br />12/9/2009<br />6<br />Bitsy Griffin Lessons 2-24 & 25<br />
7. 7. Suggestions:<br />+ / - whole numbers<br />Add any whole #s from fraction to #<br />12/9/2009<br />7<br />Bitsy Griffin Lessons 2-24 & 25<br />
8. 8. Problem 1:<br />3 2/3 + 5 1/6 =<br />Answer is close to?<br />9<br />12/9/2009<br />8<br />Bitsy Griffin Lessons 2-24 & 25<br />
9. 9. Problem 1:<br />3 2/3 + 5 1/6 =<br />2/3 + 1/6<br />4/6 + 1/6 = 5/6<br />3 + 5 = 8<br />12/9/2009<br />9<br />Bitsy Griffin Lessons 2-24 & 25<br />
10. 10. Problem 1:<br />8 + 5/6 =<br />8 5/6<br />12/9/2009<br />10<br />Bitsy Griffin Lessons 2-24 & 25<br />
11. 11. Problem 2:<br />2 2/3 + 1 ½ =<br />Answer is close to?<br />4 or 5<br />12/9/2009<br />11<br />Bitsy Griffin Lessons 2-24 & 25<br />
12. 12. Problem 2:<br />2 2/3 + 1 ½ =<br />2/3 + ½ =<br />4/6 + 3/6 = 7/6<br />7/6 = 1 1/6<br />12/9/2009<br />12<br />Bitsy Griffin Lessons 2-24 & 25<br />
13. 13. Problem 2:<br />2 + 1 = 3<br />3 + 1 1/6 = 4 1/6<br />12/9/2009<br />13<br />Bitsy Griffin Lessons 2-24 & 25<br />
14. 14. Problem 3:<br />4 ¼ - 1 2/3<br />Answer be close to?<br />2 or 3<br />12/9/2009<br />14<br />Bitsy Griffin Lessons 2-24 & 25<br />
15. 15. Problem 3:<br />4 ¼ - 1 2/3<br />Answer be close to?<br />2 or 3<br />12/9/2009<br />15<br />Bitsy Griffin Lessons 2-24 & 25<br />
16. 16. Renaming practice:<br />8 ¼ = <br />7 + 4/4 + ¼ <br />7 5/4<br />12/9/2009<br />16<br />Bitsy Griffin Lessons 2-24 & 25<br />
17. 17. Renaming practice:<br />6 2/3 = <br />5 + 3/3 + 2/3<br />5 5/3<br />12/9/2009<br />17<br />Bitsy Griffin Lessons 2-24 & 25<br />
18. 18. Problem 3:<br />4 ¼ - 1 2/3<br />¼ - 2/3<br />3/12 – 8/12<br />Oops! What can we do?<br />12/9/2009<br />18<br />Bitsy Griffin Lessons 2-24 & 25<br />
19. 19. Problem 3:<br />Rename the first mixed number to <br />3 + 12/12 + 3/12<br />3 15/12 – 1 8/12<br />2 7/12<br />12/9/2009<br />19<br />Bitsy Griffin Lessons 2-24 & 25<br />
20. 20. Problem 3:<br />Rename the first mixed number to <br />3 + 12/12 + 3/12<br />3 15/12 – 1 8/12<br />2 7/12<br />12/9/2009<br />20<br />Bitsy Griffin Lessons 2-24 & 25<br />
21. 21. Problem 4:<br />4 ¼ - 2 1/3 <br />3/12 – 4/12<br />???<br />3 12/12 + 3/12 =<br />3 15/12<br />12/9/2009<br />21<br />Bitsy Griffin Lessons 2-24 & 25<br />
22. 22. Problem 4:<br />3 15/12 - 2 4/12<br />1 11/12<br />12/9/2009<br />22<br />Bitsy Griffin Lessons 2-24 & 25<br />
23. 23. EQ:<br />How do I add or subtract mixed numbers?<br />12/9/2009<br />23<br />Bitsy Griffin Lessons 2-24 & 25<br />