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# maths

### percentages

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

the value of a painting increase by 12% to £1680 . what was the original price of the painting | 112%=£1680 / 1% then / 112 from £1680 = 1% then that= 150 * 100 100% what +£1500 |

find 7% of 80 | 7 /100 * 80 = 5.6 |

find 12% of 90 | 12 / 100 * 90 = 10.8 |

increase 300 by 10% | 330 |

decrease 500 by 20 % | 400 |

increase 72 by 20 | 86.4 |

decrease 200 by 30 | 140 |

Naomi buys a top hat that been reduced in the sale by 35% if the sale price is £ 13.00 what was the original price | 100-35 =65 13.00 / 65 =0.2 0.2 * 100= £20 |

nicola increase the price of the bookcase by 26% if the bookcase is now price at £ 819 what was the original price | 100+26 = 126 819/126 =6.5 6.5 * 100= 650 |

10% of 50 | = 5% |

1% of 200 | =2 % |

50 % of 190 | =95% |

25% of 800 | = 200% |

17% of 800 | = 13.5 % |

3% of 250 | = 7.5 % |

0.5% of 700 | = 3.5 |

compound interest | |

josh put's £ 3000 into a bank he gets 7 .2% interest per year how much does josh have after 5 years | 100% + 7.2 =107.2 107.5 / 100= 1.072 ( 1.072)5 |

nicola puts £ 200 in a bank account with interest of 10 % per year how much does nicola have after 3 years | 100%+10= 110 110 / 100= 1.1 1.13 =1.331 200* 1.331= 266.2 |

multipliers | |

increase by 12 % | 100+12 = 112 112/100 =1.12 |

decrease by 40% | 100 - 40 = 60 60/100 =0.6 |

12% of an amount | 0.12 |

increasing by 17.5 % | 1.175 |

increasing by 7% | 1.07 |

find 33% of an amount | 0.33 |

decreasing by 13 % | 0.87 |

decreasing by 12.6 | 0.814 |

increasing by 5.3 % | 1.053 |

decreasing by 0.2 % | 99.8 |

finding 16 of an amount | 0.16 |

increasing by 0.05% | 1.0005 |

decreasing by 97% | 0.03 |

increasing by 120 % | 2.2 |

A gym has 275 members 40% are bronze members 28% are silver members The rest are gold members | Work out how many members is equal to 40% - 40/100 times 275, do the same for 28%. Add the 2 together and take away from 275 to give you the answer. 88 |