Nart Posted September 27, 2012 Share Posted September 27, 2012 I want to buy Math Mammoth Blue 2A so my son can have more practice adding to 20 by making a ten. He is in SM 1A but there aren't enough practice problems that cover addition to 20. He can do them easily with manipulatives but somtimes forgets a step when doing them in his head. I was going to make up some problems but just found out that MM has 55 pages of problems involving adding and subtracting to 20 for only $4.50. Is there a difference between buying through Kagi vs. Currclick? Is one better than the other? Quote Link to comment Share on other sites More sharing options...
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