Lesson Plan # 14 - Word Problem Solving,
Translating Word Phrases:
- (5 min) Mental Math
- Start with 125, multiply by 10, then subtract 50 [1200]
- What is the decimal for 526 divided by 100? [5.26]
- What is the area of a triangle whose base is 9 inches and whose
height is 18 inches? [81 sq. in.]
- What is the perimeter of a rectangle whose sides are 3 1/2 feet and 4
1/2 feet? [16 feet]
- What is 600 times 600? [360,000]
- (5 min) Review of homework #13 (<= 3 problems)
- (10 min) Discuss word phrases and word problems:
- (5 min) Discuss these phrases and the
expressions they represent:
Phrase |
Expression |
three times a number |
3x |
half of a number |
x/2 |
one minus three times a number |
1 - 3x |
a number increased by 5 |
x + 5 |
a number decreased by 8 |
x - 8 |
- (5 min) Discuss word equations. Discuss the fact that the following
phrases are equal ("=") signs:
- "you get ..."
- "the result is ..."
- "is ..."
Discuss these sentences and the
equations they represent:
English sentence |
Equation |
I subtract one from my number and I get
five. |
x - 1 = 5 |
I multiply my number by 4 and I get 8. |
4x = 8 |
I take half of my number, decrease it by 6 and the result is 4. |
x/2 - 6 = 4 |
- After this discussion, pass out the word phrases handout along with
the in-class exercise.
- (Remainder of class) In-class Exercise.
- Hand out homework as students successfully complete the in-class
exercise.
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