## Lesson Plan # 25 - Review of Lessons 15 - 23

1. (5 min) Mental Math
1. How many ways can I reorder the letters in the word "DESK"? [24]
2. What is one third of one third of one third? [1/27]
3. Multiply 2/3 by 1/4 and reduce [1/6]
5. Which is larger, 1/4 or .255? [.255]

2. (5 min) Review of homework #24 (<= 3 problems)

3. (10 min) Review of the second half of the year:
1. Find the mean, mode, median, and range of this set:
22, 11, 16, 18, 24, 11, 31  [Mean=19.0,mode=11,median=22,range=20]

2. Probability of getting 2 red marbles out of a bag of 9 red, 5 blue and 4 green marbles:
9      8      4
--- X  ---  =  --- (have students do the canceling)
18     17      17

3. How many ways to reorder the letters in these words:
GOALS                   MANY
5 X 4 X 3 X 2 X 1 = 120    4 X 3 X 2 X 1 = 24

4. Hand out homework as students successfully complete the in-class exercise.
Special note for Practice Competition #2 (Guess-and-Check):
If your students are still having trouble with guess-and-check, then you might want to work through problem one together, then turn them loose on the remaining problems.