245
Subtraction means distance on the number line. From 83 to 100 is 17, from 100 to 300 is 200, and from 300 to 328 is 28. Therefore, 328 - 83 = 17 + 200 + 28 = 245. --- Alternately, treat the one's digits separately from the others: 320 - 80 = 240, and 8 - 3 = 5, so 328 - 83 = 245.