Percentage mental math practice11/23/2023 Students will be amazed at how they are able to figure out all this using mental math! Partner Activity To find `2.5%`, you could do half of `5%` or a tenth of `25%`. Say “which related percents can we use to find this one?” This will get students thinking about following the number string and using mental math to find the percentages.įor `85%`, some might want to multiply `5%` by a number - which is fine as long as they can do it mentally. Ask students for their thoughts as you work through each percent. Keep using this process to fill out each box as a class. We start out with `10%`, which we already know. You could choose to write these percents one by one on the board or show them all at once. Tell students they are not allowed to use a calculator or do any calculations on paper to do the number strings. In this part of the lesson, you will do a number string with percents where you use the percents you know to figure out those you don’t. Explore why they think we should divide by `10` (this is to ensure that they don’t confuse `10%` and dividing by `10`).įinding `30%`: While some students might want to think of `30%` without relating it to anything they have found so far, you want to talk about how you can get to `30%` of a number by using `10%`. There are likely some students who would say we could just divide by `10`. Some might want to set up a proportion like `10/10 = ?/80`. Some might want to multiply by `0.1` on paper. Finding `10%`: Figure out how students think about `10%` of `80`.
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