Task# Changing Currency

Illustrative MathematicsVaries

The purpose of this task is for students to notice that if the dividend and divisor both increase by a factor of 10, the quotient remains the same. This sets them up to understand the rules for moving decimal points when performing long division. After students have described the pattern in the table, the teacher can challenge them to explain why this pattern must always hold, or can explain the pattern to the students. One way to do this is to write the first division question as and note that if we multiply both sides by 10, we get the second division problem.