Standard practice
Multiply by the reciprocal of the divisor.
1/31/31/31/31/31/31/31/31/31/31/31/31/31/31/3
Mei has 5 cups of flour at the cooking lab and packs them into groups of 1/3 batches. How many groups fit?
Dividing by a unit fraction asks how many of those small pieces fill the whole amount. Multiplying by the denominator counts the pieces. Multiplying the original numbers as if they were a part of a part answers “how large is one share?” which is a different question.
Problem 1 of 9. Activate, study a model, try guided items, work independently, apply, and reflect.