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Welcome to our Math lesson on Writing a Number as a Percentage of another Number, this is the second lesson of our suite of math lessons covering the topic of Definition of Percentages, you can find links to the other lessons within this tutorial and access additional Math learning resources below this lesson.
Writing a Number as a Percentage of another Number
We can express a number A as a percentage of another number B by dividing A by B and express the corresponding result (either fraction or decimal) as a percentage. In general
A = x% of B ⟹ x = A × 100/B
Let's explain this point through an example.
Example 2
Express the numbers 21 and 37 as percentages of 50.
Solution 2
Using the above formula where A = 21 and B = 50, yields
A = x% of B ⟹ x = A ×100/B
21 = x% of 50 ⟹ x = 21 ×100/50 = 42
Hence, 21 = 42% of 50.
Again, taking A = 37 and B = 50, yields
A = x% of B ⟹ x = A ×100/B
37 = x% of 50 ⟹ x = 37 × 100/50 = 74
Hence, 37 = 74% of 50.
More Definition of Percentages Lessons and Learning Resources
Percentages Learning Material| Tutorial ID | Math Tutorial Title | Tutorial | Video
Tutorial | Revision
Notes | Revision
Questions |
|---|
| 5.1 | Definition of Percentages | | | | |
| Lesson ID | Math Lesson Title | Lesson | Video
Lesson |
|---|
| 5.1.1 | Definition of Percentages | | |
| 5.1.2 | Writing a Number as a Percentage of another Number | | |
| 5.1.3 | Finding the Percentage of an Amount | | |
| 5.1.4 | Calculating the Percentage of another Percentage of an Amount | | |
| 5.1.5 | Operations with Percentages | | |
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- Continuing learning percentages - read our next math tutorial: Percentages, Fractions and Decimals
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