Learn Class 8 Math - Comparing Quantities

Ratio

It is related to comparing two different quantities.

Percentage

It has a unique symbol of % and represents every hundred.

Finding Discounts

Commonly, there's a purchase, and therefore, the product is at a reduced price.

Essentially discount is the reduction within the market value to extend the sale and market the products.

Discount % = Discount/Market Price * 100

Gains and losses resulting from buying and selling

When we buy or sell something within the market, there are such a big amount of things enclosed in it, like the price of the product, some overhead expenses to gift it, some promotion, etcetera.

Terms Related to Buying and Selling:

  • Cost Price (CP): Cost worth is the actual amount paid by the manufacturer to provide it or produce the service.
  • Selling Price (SP): The quantity at which the merchandise is sold within the market by the retailer.
  • Profit: Once commerce a product, if the vendor has some monetary gains, it is aforementioned a profit.
  • Profit = SP-CP
  • Loss: The negative financial revenue that a seller needs to bear while selling the product.
  • Loss = CP-SP

Compound Interest

Interest is the more money paid by the banks on our money at a set interest rate.

Compound Interest(CI) = Amount(A) – Principal(P)

Simple Interest

Simple Interest = Principal(P)* Time(T)* Rate(R)/ 100

Learning Videos for 8th Grade Math - Comparing Quantities

Comparing Quantities Sample Questions for Class 8

Question 1

Which fraction is equivalent to 0.bar{54} ?
A. 54/999
B. 54/100
C. 54/9
D. 54/99

Question 2

In the year 2000, Los Angeles, CA had a population of about 3,700,000 people. What is this number in scientific notation?
A. 3.7 xx 10^-6
B. 3.7 xx 10^-5
C. 3.7 xx 10^5
D. 3.7 xx 10^6

Question 3

Choose the correct match for 330,000,000.
A. 3.3xx10^7
B. 3.3xx10^8
C. 3.3xx10^9
D. 3.3xx10^10

Question 4

Write in scientific notation.42,300
A. forty-two thousand, three hundred
B. 4.23 xx10^4
C. .00423
D. 40,000 + 2,000 + 300

Question 5

Choose the correct notation for 700,000.
A. 7xx10^5
B. 7xx10^8
C. 7xx10^3
D. 7xx10^4