posted by:

Anne Collins
on May 13, 2003
at 11:49AM

subject:

Analyzing A student produced method.

The student appears to be subtracting the digits and is using a negative sign to indicate that 27 = 5, 3  5 = 2, and 1  0 = 1. Since the child appears to have listed the numbers in the correct place value it appears as though the subdifference is 100  20  5 which is 75.

