When Can We Get Ice Cream?

When Can We Get Ice Cream? is a Grade 4 divisibility investigation built around calendar dates. Students mark every day of the month that is not divisible by any number from 2 through 10, then compare the remaining dates with the prime numbers from 1 to 31. The activity turns divisibility rules into a pattern students can see on a familiar calendar.

Use it in small groups when students are learning divisibility, factors, and the definition of prime numbers. The special case of 1 creates a useful discussion about why it is not prime even though it survives the divisibility test. Create a free Find a Math Game account to generate teacher-ready lesson support for When Can We Get Ice Cream? No credit card is required, with 3 lifetime lesson generations.