## Wednesday, January 13, 2010

### Emmanuel's Scribepost for January 13

QUESTION 13:

13. a) Use a calculator to convert 1/3 to a decimal. How could 1/3% be shown using a hundred grid?
1/3 as a decimal would be 0.33333333...
This is how it would be shown on a graph:

b) Why are percents involving repeating decimals sometimes difficult to show on a hundred grid?

It is hard to show repeating decimals on graphs, because you would have to divide a single block into thousands or more!

QUESTION 12:
12. A 250-mL glass of milk contains 30% of the recommended daily value of calcium. Use a hundred grid to show how many glasses of milk you would need to drink to get 100% of the daily value of calcium.

Each GREEN area represents a glass of milk containing 30% of the recommended daily value of calcium. So if you drink 3 glasses, you get 90% of the RDVC. So the BLUE area at the bottom represents 1/3 of a 250mL glass. Which would be 10%, and give you your full 100% of RDVC!!

Question 5:
What percent is represented by each diagram if a completely shaded grid represents 100%

a) 0.3% or 3/10%

b)125.5% or 125 1/2

c)282%

QUESTION 1:

1. Use hundred grids and words to describe the similarities and differences between a percent less than 1%, a percent between 1% and 100%, and a percent greater than 100%.

carla841 said...

great job !
nice graphs..very colorful post.

vanessa 8-41 said...

Good job Emmanuel ! Your explanation for question 12 was very understandable. Although your picture was very small for question 12, I still understand it. I really liked your use of colours but they were kind of light but still eligible. Did you find the answer out yet because if you did, maybe you should update it. Other than those little things, good job.