SaiBook.us SAT-3

Lesson

Title: Measurment

Grade: Best-SAT3 Lesson: S4-P1

Explanation: Hello students, let us learn a new topic in SAT-3 today with definitions, concepts, examples, and worksheets included.

Lesson:

Definition: Percentage

A percentage is a way of expressing a number as a fraction of 100.
It is denoted using the percent sign, "%".
To calculate the percentage of a number, multiply the number by 100 and then divide by the total or original number.
The formula for calculating a percentage is:
\$"Percentage" =("part"/"whole") times 100\$

$1$

Explanation: The shopkeeper had 22 beads in total. Among them, 10 were red, and 12 were of a different color. The percentage of red beads is 45%.

Definition: Percentage Increase

Percentage increase is a method used to express the extent of an increase in a value as a proportion of the original value, in percentage terms.
To calculate the percentage change, simply subtract the original value from the new value, divide this difference by the original value, and then multiply the result by 100.

\$"Percentage"(%)\$ = \$(("Old value" - "New value")/("Old value")) \times 100\$

$2$

Explanation: In the given image, if we add 8% of 56, the result is 60.48.

Definition: Percentage Decrease

Percentage decrease is a way to express the extent of a decrease in a value as a proportion of the original value, expressed in percentage terms.
To calculate the percentage change, simply subtract the original value from the new value, divide this difference by the original value, and then multiply the result by 100.

\$"Percentage"(%)\$ = \$(("Old value" - "New value")/("Old value")) \times 100\$

$3$

Explanation: In the given image, if we decrease 60 by 3%, the result is 58.2.