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]
    4. Start with 22, add 55, then divide by 7 [11]
    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.