# Is 75 percent good in grade 9

### Simple percentage tasks

You can calculate some percentage problems very quickly and easily. You don't need a calculator.

**Example:**

Calculate 50% of 350.

50% is half.

As a fraction $$ 1/2 $$. This means, **divide by 2**.

350 $$:$$ 2 = 175

50% of 350 is 175.

How to calculate percentages in your head:

1. Convert the percentage to a fraction.

2. Use the fraction to calculate the percentage.

### The most important percentages

These percentages are easy to calculate with in your head.

percentage | You reckon | example |
---|---|---|

$$25% = 1/4$$ | divide by 4 | 25% of € 800 calculate 800 $$: $$ 4 = 200 25% of € 800 is € 200. |

$$75% = 3/4$$ | divide by 4, then times 3 | 75% of 32 € calculate 32 $$: $$ 4 $$ * $$ 3 = 24 75% of € 32 is € 24. |

$$ 33% approx 1/3 $$ | divide by 3 | 33% of 90 € calculate 90 $$: $$ 3 = 30 33% of 90 € is 30 €. |

$$10% = 1/10$$ | divide by 10 | 10% of € 98 calculate 98 $$: $$ 10 = 9.8 10% of € 98 is € 9.80. |

$$20% = 1/5 $$ | divide by 5 | 20% of 150 € calculate 150 $$: $$ 5 = 30 20% of 150 € is 30 €. |

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