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