1. The elevator situation
Mrs. Catlin – PBL Unit 2009

2. How Much Weight can an elevator hold?
What Do You Think?
How Many People?
2000 lbs.
How Many Pounds?
To maximize efficiency there can be no less than or no more than

3. The Delivery Man 227 lbs. 35 lbs. 25 lbs. each
How much does the delivery man weigh?
How much does the dolly weigh?
How much do the packages weigh? Each?
227 lbs.
35 lbs.
25 lbs. each

4. Write it as a mathematical expression
227 lbs. 35
lbs. 25
lbs. 25
lbs. 25
lbs.
= 337
Can you rewrite it in a more condensed version?
x 3 = 337

5. Wheelchair, grandfather & Kid
Write the mathematical expression 85
103 44 =
232

6. Another addition to the elevator!
171 lbs

7. Congratulations it’s twins!
They weigh 135 lbs each
Write the mathematical expression in a condensed version
135 x 2

8. The business man How much does the business man weigh?
You’ll have to wait until the end to find out!

9. Mommy + baby + Groceries = 206 lbs
Write the mathematical expression

10. Family of Five 39
232 69
155
543 lbs

11. Time to put it all together
To Equal 2000 lbs

12. x 3
171
135 x 2

13. Remember EVERYTHING Must = 2000
Still missing…
241
Remember EVERYTHING Must = 2000

14. And what do you get?
x x 2 +____ = 2000
241

15. Why are there parentheses?
( x 3) +
( )
+ (171)
+(135 x 2) +
(241) +
( ) +
( ) =
2000