Test Android StudyStack App

Please help StudyStack get a grant! Vote here.

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

Question | Answer |
---|---|

How do you add/subtract fractions? | Make Improper - Find Common Denominator - Add/subtract top numbers - Simplify |

How do you multiply fractions? | Make Improper - Multiply Across - Simplify |

How do you divide fractions? | Make Improper - Change division to multiplication and flip 2nd fraction - multiply straight across - Simplify |

How do you multiply decimals? | Multiply like normal - count decimal spots in each number - move decimal over number left the amount of the sum |

How do you add/subtract decimals? | Line up decimal places - add zeroes in empty spots - add/subtract like normal |

How do you change % into a decimal? | Divide by 100 or move decimal 2 spots left |

How do you change decimal into %? | Multiply by 100 or move decimal 2 spots right |

How do you change % into a fraction? | Put the % over 100 - move decimal of top and bottom if needed - simplify |

How do you change a fraction into a decimal? | Long division - Top divided by bottom |

How do you find the percentage of change? | Find the change by subtraction - divide by the original amount - convert into % form |

What is the percent proportion? | Part/Base = %/100 |

How do you solve proportions? | Set up 2 fractions (make unknown on top) - multiply both sides by bot term - include units |

How do you find percent given part and base? | Divide part by base - change into % form |

How do you find part given percent and base? | Change % to decimal - multiply by base |

How do you find base given part and percent? | Divide part by percent and multiply by 100 |

How do you calculate taxes/discounts? | Change % to decimal - multiply by cost - add/subtract to find total cost |

How do you write a number in scientific notation? | Move decimal between 1st two digits - count spots moved and that is exponent of the 10 |

How do you change a number from scientific notation? | Move decimal amount of spots in the 10 exponent - add zeroes in blank spots |

How do you find mean (average) of a data set? | Add numbers and divide by how many there are |

How do you find mode of a data set? | Whichever number appears most often |

How do you find range of a data set? | Find difference between top and bottom terms |

How do you find a unit rate? | Write fraction with units - set it equal to fraction over 1 - divide to find top value |

How do you find simple interest? | I = Prt - P-money start with, r-rate as decimal, t-time in years |

How do you find the probability of 1 event? | Fraction where you put outcomes of success over total possible outcomes |

How do you find the probability of multiple events? | Multiply probability fractions of each individual event occuring |

HOw do you multiply/divide negatives? | Multiply/divide like normal - add sign where same signs make positive / different negative |

How do you find area of a circle? | Area = pi x radius squared = 3.14 x r x r |

How do you find area of a rectangle? | Area = length x width = l x w |

How do you find area of a triangle? | Area = 1/2 x base x height = 1/2 x b x h remember base and height are perpendicular |

How do you find perimeter of a shape? | Add the lengths of the sides together |

How do you find distance around a circle (circumference)? | C = pi x diameter = pi x 2 x radius |

How do you find volume of a prism? | V = area of base x depth = A x d |

How do you find volume of a cone or pyramid? | V = 1/3 x area of base x depth = 1/3 x A x d |

How do you find Surface area of a shape? | Add areas of each face together |

Created by:
phillipds
on 2010-03-16