Fifth graders learn shortcuts that reveal whether a number can be split evenly by 2, 3, 5, 9, or 10, just by looking at its digits, then check what they know.
Students will be able to…
Is 1,230 divisible by 5? You could do the long division, or just glance at the last digit. How do divisibility rules let you tell at a glance?
Project this and answer each question about the divisibility rules for 2, 3, 5, 9, and 10 — read the explanation after each one.
Tap any phase to open the teacher moves and student actions.
Is 1,230 divisible by 5? You could divide it out, or you could just glance at the last digit. Divisibility rules let you tell at a glance. How do they work?
Students answer questions about divisibility rules.
Students test numbers against the rules.
Students make a divisibility reference.
Students reflect on the rules.
Aligned to the Common Core State Standards for Mathematics.
Find factor pairs and multiples, and tell whether a number is prime or composite.
Find whole-number quotients using place value and the properties of operations.
Look for and make use of structure.
Look for and express regularity in repeated reasoning.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students list the rules for 2, 3, 5, 9, and 10 with an example each, then find one number that passes all of them, so the shortcuts stick. A printable divisibility-rules worksheet is in the Mathematics library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.