Subtracting Large Numbers with Place Value Disks

To subtract one number from another, like 825,346 - 315,273, 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. 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. There are 5 hundred thousands, 1 ten thousands, 7 tens, and 3 ones, so 825,346 - 315,273 = 510,073.

Subtracting Large Numbers using the Brainingcamp Place Value Disks virtual manipulative.

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