Raquel's Scribepost for November 4th

QUESTION #17 FOR 2.2

• TWO wooden poles measured 1.35m and 0.83m in length. To make a new pole they were attached by overlapping the ends and trying them together. The length of the overlap was 12cm. What was the total length of the new pole in meters.

- For this question all I really did was add 1.35m and 0.83m and subtracted the results with 12cm.



Yeah, that's mostly it. Sorry, I didn't get enough time to take some pictures.

Karra's Scribe Post for November 4, 2010

2.2 - Text Book
Question: #16

Bella is more comfortable working with integers than with positive and negative decimal numbers. This is her way of understanding -4.3 + 2.5 .

-4.3 is -43/10 or -43 tenths

2.5 is 25/10 or 25 tenths

-43 tenths + 25 tenths is -18 tenths

-18 tenths is -18/10 or -1.8

So, -4.3 + 2.5 = 1.8

A ) Use Bella's method to determine 6.1 + (-3.9).

B) How could you modify Bella's method to determine 1.25 -3.46?

This is how you do the practise 2.2 question 14 in the textbook.

The question:Saida owns 125 shares of an oil company. One day, the value of each share dropped by 31 cents. The next day the value of each share rose by 18 cents. What was the cahnge in the value of Saida's shares?

The solution : Lets say each share is a dollar. now it drops by 31 cents. Its value is now 69 cents. Now we add 18 cents. We have 87 cents. Then we have to figure out what the value change would be now for one share. A share has dropped by 13 cents. Times 13 by 125, or you can do it a simpler way by times by 5 first to get 65 cents . Times by 5 again to get $3.25. Times by 5 one more time to get the final answer $16.25.
The Answer :The total value change of Saida's shares altogether dropped by $16.25.

Kathleen's Scribepost for November 4, 2010

2.2

Question #12

A pelican dives vertically from a height of 3.8 m above the water. It then catches a fish 2.3 m underwater.

a) Write an expression using rational numbers to represent the length of the pelican's dive.

b) How long is the pelican's dive?

a) Answer will be a rational number or integer cause the question asked to write an expression using rational number.

3.8 - (-2.3)

3.8 is positive because it's above water and -2.3 is negative because the pelican went underwater.....like descending.

The answer is a positive because the subtrahend is much bigger than the minuend.

b) The pelican's dive is about 6.1 meters long.