## Tuesday, October 11, 2011

### Melina's proportion post

Definitions:
Ratio:
Two term ratio: Compares two quantities measured in the same unit.
Three term ratio: Compares three quantities measured in the same unit.
Part to part ratios: Compares differ net parts of a group to each other.
Part to whole ratios: Compares on part of a group on the whole group.
Words: three compared to six or 3:6
Ratio Notation: 3:6
Fraction 3/6
Rate: A comparison of two quantities measured different units.
Proportion: An equation which states that two ratios or fractions are equal.
1) 5 h to travel 360 miles is about 72 mph
2) As a playgroup worker, if i increase the amount of apple juice i am serving at the playground from 25ml to 100ml, how much should i increase the orange juice to keep the same quantities of the proportion? The orange juice is 50ml to start with.
What are three ways you can prove that equivalent ratio statements are true?
3/4 = 12/16 or 4/9 = 16/32
1) You can multiply or divide horizontally. (Top left to the top right, bottom left to the bottom right.
2) You can multiply or divide vertically. ( Numerator to the denominator for each of the ratios)
3) You can multiply or divide diagonally. ( Top left to the bottom right, Top right to the bottom left.)
Task 4: Here is a video on proportions. Hope you enjoy!