### fractal sound:

Pink noise
* fractal sound.
* has an equal amount of energy per octave of bandwidth
* is white noise that has been filtered to reduce the volume at each octave.
* variant of white noise.

Fraction
* All fractions represent parts of a whole.
* Are Parts of Things.
* Every fraction has two numbers.
* Shows the relationship between arithmatic fractions and algebriac fractions.
* are a part of everyday life
  - actual numbers
  - chemicals
  - complex mixtures of chemical compounds that all have a similar boiling point
  - halves, fourths, and eighths
  - incomplete numbers
  - quicker and more accurate to manipulate by hand than decimals
  - rational numbers
  - the number of radiation treatments
  - to be expressed as decimals
  - used when there are parts of a whole number
* come about by dividing unity into parts, and are thus by definition positive.
* consist of two numbers.
* containing potent odorants are identified using electro-olfactogram recordings.
* exist everywhere.
* have nothing to do with counting.
* involve working with mixed numbers.
* use the same hieroglyph characters as numbers.
+ Quantity, Measuring, Fraction numbers: Numbers
  * Fractions are used when there are parts of a whole number. The dial on a machine may be marked with four parts between each whole number. A scale with a bag of potatoes may show five and three-fourths kilograms. This would be almost six kilograms.

### fraction:

Decimal
* Adding decimals is just like adding any other numbers.
* Some decimals are finite or are considered as such because of their use.
* are easier to add, subtract, multiply and divide
  - formed by marking off a ruler in ten equal parts
* are possible for fractions of day
  - hour
  - minute or second
  - preferred to fractions
  - really a form of fractions
  - the subject of the day in math
* do more than make the math easier.
* handicap the teaching of arithmetic and so inhibit understanding of the physical world.
* have a point.
* is the number of decimal places in the result.
* make a point.
* teaches how to add, subtract, multiply and divide using decimals.
+ Quantity, Measuring, Decimal numbers: Numbers
  * When measuring things, a whole number might not be the best answer. A distance might be longer than 5 meters, but less than 6 meters. Meter sticks are marked off in parts of a meter. Decimals are formed by marking off a ruler in ten equal parts. Each part is a tenth. 5.2 meters is a little bit longer than 5 meters. 5.7 meters is a little bit shorter than 6 meters. Each of these tenths can be marked with ten smaller parts. The one hundred centimeters on a meter stick are done this way.

Ejection fraction
* is the percent of blood pumped out of a heart chamber during each beat
  - the blood pumped out every time the heart beats
  - volume of blood expelled from the heart during one beat cycle
* measure of how well the heart is pumping blood.
* measures the heart muscles ability to pump out blood from the heart.

Hundredth
* are rank.
* have two digits after the decimal point.
* indicate two digits after a decimal point.

Improper fraction
* Some improper fractions are also whole numbers.
* are equivalent to mixed numbers

Tenth
* are numbers
* have one digit after the decimal point.

### fragile resources:

Archaeological site
* Every archaeological site is affected by conditions such as soils and climate.
* are fragile resources
  - important for the information they contain about past human ways of life
  - natural resources, holding clues to our past
  - non-renewable resources
  - non-renewable, cultural resources
  - sites
  - time capsules from the past
* provide vital records of the past and are protected by law.
* represent the cultural heritage of many people, particularly native people.