First we practice writing fractions as decimals and vice versa (up to 3 decimal digits). Then I show an easy way to compare decimals: you can write the decimals in a place value chart or table, where it is easy to compare them place by place.
Lastly we do a few practice problems comparing decimals. Be sure to avoid the common student misconception where students think that the part to the right of the decimal point is some kind of "number" in itself. Such students could say that 9.114 is greater than 9.4, thinking that 114 is greater than 4.
Add & subtract decimals using mental math — video lesson
Math Mammoth Decimals 2 — downloadable worktext
Math Mammoth TourConfused about the different options? Take a virtual email tour around Math Mammoth! You'll receive: An initial email to download your GIFT of over 400 free worksheets and sample pages from my books. Six other "TOURSTOP" emails that explain the important things and commonly asked questions concerning Math Mammoth curriculum. (Find out the differences between all these different-colored series!)This way, you'll have time to digest the information over one or two weeks, plus an opportunity to ask me personally about the curriculum. A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time) We respect your email privacy.
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"Mini" Math Teaching CourseThis is a little "virtual" 2-week course, where you will receive emails on important topics on teaching math, including:
- How to help a student who is behind You will also receive: A GIFT of over 400 free worksheets and sample pages from my books right in the very beginning.![]() We respect your email privacy.
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Maria's Math TipsEnter your email to receive math teaching tips, resources, Math Mammoth news & sales, humor, and more! I tend to send out these tips about once monthly, near the beginning of the month, but occasionally you may hear from me twice per month (and sometimes less often). Peek at the previous tips here. You will also receive:
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