Multiplication algorithm: 5 and 6-digit multiplication (5th grade math)

The multiplication algorithm works the same way with 5 and 6-digit numbers as with shorter numbers. :) First, it makes sense to estimate the final answer, so you can catch gross errors in multiplication.

Here is an example of multiplying a money amount using the standard algorithm. We multiply as if there was no decimal point, and lastly, add the decimal point to the answer. Before multiplying, I estimate the final answer by using rounded numbers.

See also

Example: 2-by-3 digit multiplication — video lesson

The connection between multiplication and division, simple equations, bar models, terminology

Math Mammoth Grade 5 curriculum

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