Do you know Singapore Subtraction? 
I guarantee this is the #1 Fastest Mental Subtraction Method!! Try it yourself :)
 
Please check out my YouTube Channel "Math Challenge" for the SOLUTION! SCAN that QR Code to take you right to the video!
 
PLEASE SUBSCRIBE to my YouTube Channel! I really appreciate it :) 
 
And if you could LEAVE A REVIEW for my problems, you are my new favorite person ;) 
 
But seriously, 
THANK YOU SO MUCH for all that you do everyday in your classrooms! 
WE ALL ROCK for making a difference!! 
 
E-mail: knishimori@bridgemath.com