Estimate the answer to a multiplication word problem. Round large numbers to their leftmost place. Then, use the understanding of powers of 10 and the properties of multiplication to quickly find the estimate of the answer
A. Factor out 10, 100, or 1,000 from a given number
B. Solve multiplication problems using the associative and commutative properties
C. Solve a multi-digit multiplication problem using factoring out and properties of multiplication (Level 1)
D. Solve a multi-digit multiplication problem mentally
E. Solve a multi-digit multiplication problem using factoring out and properties of multiplication (Level 2)
F. Round multi-digit numbers to estimate the area of a rectangle