## Revision Notes for CBSE Class 8 Maths Chapter 8 – Free PDF Download

Free PDF download of Class 8 Maths Chapter 8 – Comparing Quantities Revision Notes & Short Key-notes prepared by expert Maths teachers from latest edition of CBSE(NCERT) books. All Chapter 8 – Comparing Quantities Revision Notes to help you to revise complete Syllabus and Score More marks.

Maths NCERT Solutions for Class 8

Chapter Name | Comparing Quantities |

Chapter | Chapter 8 |

Class | Class 8 |

Subject | Maths Revision Notes |

Board | CBSE |

TEXTBOOK | CBSE NCERT |

Category | Revision Notes |

**Quick Revision Notes**

**Ratio**: Comparing by division is called ratio. Quantities written in ratio have the same unit. Ratio has no unit. Equality of two ratios is called proportion.- Product of extremes
**Percentage**: Percentage means for every hundred. The result of any division in which the divisor is 100 is a percentage. The divisor is denoted by a special symbol %, read as percent.**Profit and Loss**:

(i)**Cost Price**(CP): The amount for which an article is bought.

(ii)**Selling Price (SP):**The amount for which an article is sold.- Additional expenses made after buying an article are included in the cost price and are known as
**overhead expenses**. These may include expenses like amount spent on repairs, labour charges, transportation, etc. **Discount**is a reduction given on marked price. Discount = Marked Price – Sale Price.- Discount can be calculated when discount percentage is given. Discount = Discount % of Marked Price
- Additional expenses made after buying an article are included in the cost price and are known as
**overhead expenses.**CP = Buying price + Overhead expenses - Sales tax is charged on the sale of an item by the government and is added to the Bill Amount. Sales tax = Tax% of Bill Amount
**Simple Interest**: If the principal remains the same for the entire loan period, then the interest paid is called simple interest. SI=P×R×T100SI=P×R×T100- Compound interest is the interest calculated on the previous year’s amount (A = P + I)

(i) Amount when interest is compounded annually =P(1+R100)n=P(1+R100)n P is principal, R is rate of interest, n is time period

(ii) Amount when interest is compounded half yearly

=P(1+R100)2n=P(1+R100)2n[R2is,halfyearlyrateand2n[R2is,halfyearlyrateand2n=numberof′half−years′