mrs. catlin – pbl unit 2009 t he elevator situation
TRANSCRIPT
Mrs. Catlin – PBL Unit 2009
THE ELEVATOR SITUATION
HOW MUCH WEIGHTCAN AN ELEVATOR HOLD?
How Many Pounds?
2000 lbs.
To maximize efficiency there can be no less than
or no more than
What Do You Think?
How Many People?
THE DELIVERY MAN
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
WRITE IT AS A MATHEMATICAL EXPRESSION
227 lbs.
35 lbs.
25 lbs.
25lbs.
25 lbs.
227 + 35 + 25 + 25 + 25 = 337Can you rewrite it in a more condensed
version?
227 + 35 + 25 x 3 = 337
WHEELCHAIR, GRANDFATHER & KID
85 103 44
Write the mathematical expression
85 + 103 + 44 =232
ANOTHER ADDITION TO THE ELEVATOR!
171 lbs
CONGRATULATIONS IT’S TWINS!
They weigh 135 lbs each
Write the mathematical expression in a condensed version
135 x 2
THE BUSINESS MAN
How much
does the business
man weigh?
You’ll have to
wait until the end to
find out!
MOMMY + BABY + GROCERIES = 206 LBS
Write the mathematical
expression
FAMILY OF FIVE
543 lbs
39
69
232
155
TIME TO PUT IT ALL TOGETHER
To Equal 2000 lbs
227 + 35 + 25 x 3
85 + 103 + 44
171
135 x 2
164 + 22 + 2039 + 232 + 69 + 155 +
48
241
STILL MISSING…
Remember EVERYTHING Must = 2000
AND WHAT DO YOU GET?
227 + 35 + 25 x 3 + 85 + 103 + 44 + 171 + 135 x 2 +____ + 164 + 22 + 20 + 39 + 232 + 69 + 155 + 48 = 2000
241
WHY ARE THERE PARENTHESES?
(227 + 35 + 25 x 3) +(85 + 103 + 44)
+ (171) (241) ++(135 x 2) +
(164 + 22 + 20) +
(39 + 232 + 69 + 155 + 48) = 2000