The elevator situation

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Presentation transcript:

The elevator situation Mrs. Catlin – PBL Unit 2009

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

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

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

Wheelchair, grandfather & Kid Write the mathematical expression 85 103 44 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 39 232 69 155 543 lbs

Time to put it all together To Equal 2000 lbs

227 + 35 + 25 x 3 171 85 + 103 + 44 135 x 2 164 + 22 + 20 39 + 232 + 69 + 155 + 48

Remember EVERYTHING Must = 2000 Still missing… 241 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) +(135 x 2) + (241) + (164 + 22 + 20) + (39 + 232 + 69 + 155 + 48) = 2000