1. Warm-Up Exploration 5.12 (p. 114) Continue working on Part I
(we started this in class on the PowerPoint last week)

2. Exploration 5.12 Note: 7/13 ~ 1/2; 12/17 ~ 2/3 7/13 + 12/17 > 1
/ /
A B C D E
Note: 7/13 ~ 1/2; 12/17 ~ 2/3
7/ /17 > 1
7/13 • 12/17 means less than 7/13
7/13 ÷ 12/17 means 7/13 • 17/12. This is like 1/2 • 3/2 = 3/4, which is greater than 12/17, so
12/17 ÷ 7/13 means 12/17 • 13/7. This is like 2/3 • 2/1 which is 4/3. So

3. More Practice Given: 4/9 + 2/11 4/9 - 2/11 4/9 • 2/11 4/9 ÷ 2/11
4/9 • 2/11
4/9 ÷ 2/11
2/11 is much less than 5/9, so D.
2/11 is less than 2/9, so C.
4/9 • 2/11 is less than both of these fractions, so B.
4/9 • 11/2 is much greater than 1, so E.
/ /
A B C D E

4. Exploration 5.13 #2
3/4 + 1/6 = 11/12
3/4
1/6

5. Exploration 5.13 #4
12 • 3/4 = 9 (Note: this is operator)

6. Exploration 5.13 #5
12 - 3/4 = 11 1/4

7. Add and subtract: find a common denominator.
3/8 + 5/ /15 - 1/20
LCD = 24 LCD = 60
3 • • • • 3 8 • • • • 3
9/ /24 8/60 - 3/60
19/ /60 or 1/12

8. The Area Model and Multiplication
Use an area model to show 2/3 • 4/5

9. The Area Model and Multiplication
Use an area model to show 2/3 • 4/5

10. The Area Model and Multiplication
Use an area model to show 4/5 • 1 2/3
Multiplication is