The Mortensen Math, also known as Mortensen More Than Math, Addition Subtraction Kit, was designed to teach students addition and subtraction facts, this kit focuses on the foundational concepts of regrouping and reshaping. By internalizing these concepts, students can learn addition and subtraction facts with ease. The kit includes two of each unit bar from 1 to 9 (and one 10 bar) and cards featuring addition and subtraction facts, with a control of error built into the tray and on the reverse side of the cards.
The accompanying video demonstrates how even very young children can grasp the concepts of addition and subtraction using this kit.
Hello!
I am trying to understand how this product is used. I think i get the jist of it, but i wondered about the 8 sections containing equations. The blue is addition and the yellow subtraction, but why are there four compartments for each? I figured that static and dynamic addition would each get their own section…are there other kinds?
Thanks!
Jessica
Jessica the kit is designed to teach basic addition and subtraction facts by helping children internalize the concepts of regrouping and reshaping. You could sort the problem cards into different compartments from easy to difficult and static versus dynamic. You could also fill the compartments with just addition cards or just subtraction cards. Or you could sort the cards with specific augends, addends, minuends, and subtrahends. Really it is up to you if and how you sort the cards in the compartments. You can also turn the cards over to the answer side and make up your own problems as this kit includes addition, subtraction, and same as sign cards. There is no right or wrong way to put the cards in the compartments. Be creative and do what works for you and your child. The beauty of this kit is that it is visual, tactile, and has control of error built in.
Okay, thanks! I guess i was wondering if there was a specific reason why there are four/eight compartments. Me background in montessori materials tells me that if something is there, its there for a reason. Is it just because they fit conveniently over the top of the number bars? Thanks!
My opinion is that they are mostly there just to fit the cards in conveniently over the top of the number bars as there is nothing to indicate otherwise in any of the Mortensen More Than Math materials. Unfortunately Jerry is not here to ask otherwise I would enquire further with him.