Home Page

Calculating With Percent: What percent is 12 out of 40? & $450 is 15% of what? Home Page

Note: The mini-lesson above has audio. It leads on from mini-lesson #2 and covers two types of percent problem; first, how to find a percent when the part and the whole are known. e.g. 12 out of 40 = __%; and second, how to find the whole when the percent and part are known. e.g.15% of ____ = 450.

extract from lesson 3 - Calculating Percentages

Lesson #3


A Percentage Lesson - By

Related Resources

The Percentages Lesson explained above is aligned with the standard 7RP03 from the Common Core Standards For Mathematics (see the shortened extract below). The resources below are also aligned to this standard.

Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.




Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

Analyze proportional relationships and use them to solve real-world and mathematical problems