Subtraction within 20

Mathematics; Subtraction within 20

1) http://www.1hrmps.blogspot.sg/2013/10/introduction-of-khan-academy-for.html --> If you are interested to learn from Khan academy, a place where they can learn, and do more work over here. You need a google account to get started.


2) http://www.1hrmps.blogspot.sg/2013/07/maths-subtraction-online-link.html ==> Very important, we have seen how the regrouping and renaming is done pictorially in this website.

http://www.1hrmps.blogspot.sg/search/label/Mathematics -->
http://www.1armps.blogspot.sg/search/label/Mathematics
if you would like to refer to previous blog posts on Mathematics in my previous blog.



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New Resources: (From Matholia)
1) Subtract by counting back:  https://www.youtube.com/watch?v=4Fh4KOxsdos

2) Subtract from 10 first: https://www.youtube.com/watch?t=42&v=rZls1_CD-FE


How we did it in the class lesson:

1) Counting back using fingers

2) Using the PV(Place value) chart with concrete manipulatives. (http://nlvm.usu.edu/en/nav/grade_g_1.html)

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Maths Language: regroup, rename, make 10, counting on, counting back, altogether, take away, subtracting


PS: We'll continue with the pair /groupwork for the concrete manipulatives tomorrow morning.

Thanks.

Regards
Mdm Chan