Decimal Multiplication Tends to Be Poorly Understood

Multiple Choice

Decimal multiplication tends to be poorly understood.What is it that students need to be able to do?

A) Discover the method by being given a series of multiplication problems with factors that have the same digits,but decimals in different places.
B) Discover it on their own with models,drawings and strategies.
C) Be shown how to estimate after they are shown the algorithm.
D) Use the repeated addition strategy that works for whole number.