Task# Multiplying Decimals by 10

Illustrative MathematicsVaries

The purpose of this task is to help students understand and explain why multiplying a decimal number by 10 shifts all the digits one place to the left. This understanding builds on work around place-value that students have done with whole numbers in 3rd and 4th grade. This is an instructional task that the teacher can give students before discussing this 'digit shifting' principle for multiplying decimal numbers by 10. The task begins with a decimal number with only one non-zero digit so that students can see how to it works in the simplest case.