Subtracting Large Numbers with Place Value Disks | Brainingcamp

"To subtract one number from another, model the minuend (the first number) on a place value chart. In each place value column, remove disks from the minuend equal in number to the subtrahend (the value to be subtracted). When the second number’s digit is greater than the first number’s digit, regroup from a greater place value. Finally, count the number of disks remaining in each column.