Exercise One: Number x a Number (Commutative Law)
Today I did a new Math presentations with Dustin(11), and Anthony(7), I found some wonderful Montessori Elementary Manuals for free online HERE that I followed. I showed the boys where the materials are kept on the Math shelves, unrolled the felt mat on the floor, I followed the manual for the full presentation. Then we continued with another example.
- I had each of the boys pick out a number card 5 or below, they picked 5 and 4
- We found the 4 bead bars and placed 1 next to the 5 number card
- We took 4 bead bars 1x, 2x's, 3x's, 4x's, 5x's, and placed them in a group below
- Added them up counting by 4's, we placed 2 ten bars vertically for the answer of 20. So 5x4 was 20, what will 4x5 be??
so in conclusion 5x4=4x5, hence the Commutative Law of Multiplication...
- We found the 5 bead bars, put 1 horizontally at the top next to the 4 number card
- Took the 5 bead bars 1x,2x's,3x's,4x's, place those in a group below
- Added them up counting by 5's, placed 2 ten bars vertically for the answer of.... 20
- We then discussed that 5x4=4x5
Anthony enjoyed it so much he continued working with the materials for quite some time. I wasn't sure how he would do with this, due to the fact he hasn't been introduced to multiplication at all yet, and I was pleasantly surprised!
Labels: Montessori 6-12, Montessori Math