In the video below, I first solve two subtraction problems with the help of visuals (strawberries!). Then I explain two different ways to subtract two numbers: subtract them one at a time -- or add the numbers to be subtracted, and subtract the sum.
In the second part (below), we solve subtraction problems such as 9 − 1 − 1 − 1 and 10 − 6 − 3. I show two strategies for these: either subtract the numbers one at a time, or first add all the numbers that are going to be subtracted, then subtract the sum.
Lastly in this second part, we look at some MISSING NUMBER challenges. 😀 Children, pause the video and think about them on your own! Just make a guess, and check if works. 😀
In the last part, we first match visual models to subtraction sentences. Children, pause the video and think!
Then we solve two word problems together. But -- they don't actually have a QUESTION! We need to make up the question for these "word problems". Mathy has a witty question at first! But then he is reminded that math word problems have to do with numbers, not colors. 😀
(It's good to think what CAN be asked... what CAN be solved... with the given info.)
Addition and subtraction facts with 8 (fact families)
Two subtractions from one addition
Math Mammoth Grade 1 curriculum
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.
Note: You will FIRST get an email that asks you to confirm your email address. If you cannot find this confirmation email, please check your SPAM/JUNK folder. |
"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.
Note: You will FIRST get an email that asks you to confirm your email address. If you cannot find this confirmation email, please check your SPAM/JUNK folder. |
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:
We respect your email privacy.
|