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Math ch. 2
| Rational numbers | Natural numbers, Whole numbers, integers, fractions, Terminating decimals, repeating decimals |
| irrational | pi, decimals that go forever |
| Writing coordinates on a number line | if there is a bold arrow you write ... on the side of the arrow |
| Plotting coordinates on a number line | Make a bold arrow if there is a ... in the set of numbers on the side of the ... |
| Absolute value | How far from zero, always positive |
| Adding rational numbers with same sign | 1) Add 2) keep sign |
| Adding rational numbers with different sign | 1) Subtract 2) Take the sign of the greater number |
| Subtracting rational numbers | 1) KCC 2) Follow rules of addition |
| Adding and subtracting decimals | Line them up and drop the decimal point |
| Adding and subtracting fractions | 1) Make denominators the same 2) Add or subtract top numbers |
| Multiplying and dividing rational numbers | Different sign: negative Same sign: positive |
| Multiplying fractions | Multiply numerator and denominator across |
| Multiplying decimals | 1) put numbers on top of each other 2) Multiply like you would for a regular number 3) Move the decimal from right to left the amount of numbers after the decimal of the 2 numbers |
| Dividing fractions | KCF |
| Dividing decimals | 1) Long division 2) Put decimal directly on top |
| When doing long division if the number doesn't go in after adding a zero | put a zero on top and add another zero |
| Line plot | # line and and you put x's on the numbers |
| Frequency | How often something happens |
| Mean | Average - add up the numbers and divide by the amount added |
| Mode | # that appears most often |
| Median | Line up the numbers from least to greatest and the middle number is the median - if 2 middle numbers add them and divide by 2 |
| Range | highest # to lowest # |
| Stem and leave plot | the greatest common value is used for the stem. the number in the next greatest place value are used to form the leaves - remember to make a key |
| Probability | p(event) = # of favorable outcome / # of possible outcomes |
| Odds | Success: failure |
| If there is a fraction in the radical | do square root to both numerator and denominator |
| - , -+, nothing outside the radical | shows you what your answer should look like |
| Graph inequalities when do you put an open or filled in circle | Filled in circle --> line on the bottom of < , > Open circle --> < , > |
| Mae o bold line the way the _______________ is facing | arrow |
Created by:
ZC1234