Practice subtracting multi-digit numbers using the standard algorithm. A fact related to the answer will be revealed once each problem is correctly solved
A. Subtract two 4-digit numbers with and without regrouping in two places using column subtraction and a disk model
B. Subtract multi-digit numbers with regrouping in multiple places using column subtraction
C. Subtract multi-digit numbers with regrouping across zeros using column subtraction
E. Pretest. Finding the Area and Perimeter of a Rectangle