Don't have time to read through all the post so dk if the montessori subtraction method has been shown. I love how my DS was taught subtraction. He was borrowing at 4 w/the montessori method.
1-1st started by just subtracting w/fingers, 9-6, so put up 9 fingers and take away 6 etc. Once this was no problem then she started w/step 2.
2-She then gave questions say 11-6 (horizontal on the papter). She said to him "uh oh we don't have 11 fingers so what can we do", she told him " CIRCLE the 2nd 1 in the 11 so now it looks like ten, so then she said "ok so now we can do 10-6 which = 4 now step 3.
3- "What about the 1 inside the CIRCLE what do we do w/this , well we add it to the answer 4, so 4+1=5, that is the answer.
LOVED THIS METHOD, he was soon doing 4 digit subtraction w/borrowing no problem. I never saw this method before, it is great so anyone can subtraction w/borrowing simply by using their fingers.
Last edited by traceyqns; 02/23/09 06:58 AM.
