To use quantity, you first need to determine what you are measuring and how you are measuring it. This could be in terms of units (such as pounds, gallons, or meters) or countable items (such as apples, books, or people).
Once you have established the units or countable items, you can use quantity to compare and evaluate. For example, if you have 10 apples and someone else has 5 apples, you can say that your quantity of apples is greater.
To adjust or change the quantity, you may need to take certain actions. For example, if you want to increase your quantity of lumber, you might need to purchase more or find a supplier. If you want to decrease your quantity of gasoline, you may use less by driving more efficiently or using public transportation.
Overall, understanding quantity enables you to measure and compare different amounts, and make adjustments accordingly to meet your needs or goals.