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Common Core did derive its standards from Singapore.

We just adopted Math in Focus, the Americanized version of Singapore Math. Read more about it on thinkcentral.com. The original program can be found on singaporemath.com. It is a rigorous program that includes international standards in addition to common core. Math savvy teachers will do fine from what I hear, and teachers who lack math confidence will learn TONS with quality training, support, and teacher collaboartion. Based on school visitations, ongoing teacher training is a must!

We are implementing a K-8 program next year, but as a fifth grade teacher I will need to use some 4th and even 3rd grade materials because it is so challenging.

Great program to help you teach the bar modeling aspect of MIF:

http://www.mathplayground.com/thinkingblocks.html
Look how challenging, but so cool!

4th grade "spool of ribbon" bar modeling problem:

http://www.youtube.com/watch?v=fH9abI7jlog
LOTS of bar modeling problems can be found on youtube and teachertube.

Many schools who adopt MIF also use Every Day Calendar Math, also by Great Source.

We are not adopting this as of yet.