🔢Divisibility rules allow for quick determination of divisibility by 1-9.
🧮The rule for divisibility by 2 is whether a number is even or not.
3️⃣To test divisibility by 3, sum the digits and check if the sum is divisible by 3.
4️⃣To test divisibility by 4, check if the last 2 digits form a number divisible by 4.
5️⃣A number is divisible by 5 if it ends in 0 or 5.
What are divisibility rules?
—Divisibility rules are mathematical tricks used to quickly determine if a number is divisible by another number without performing long division.
How do you test divisibility by 2?
—A number is divisible by 2 if it is even, meaning it ends in 0, 2, 4, 6, or 8.
What is the rule for divisibility by 5?
—A number is divisible by 5 if it ends in 0 or 5.
How do you test divisibility by 3?
—To test divisibility by 3, sum the digits in the number and check if the sum is divisible by 3.
What is the rule for divisibility by 4?
—To test divisibility by 4, check if the last 2 digits of the number form a number divisible by 4.
00:00Introduction to divisibility and the importance of being able to determine divisibility quickly.
01:57Divisibility rule for 2: A number is divisible by 2 if it is even.
03:49Divisibility rule for 3: Sum the digits of a number and check if the sum is divisible by 3.
05:51Divisibility rule for 4: Check if the last 2 digits form a number divisible by 4.
07:30Divisibility rule for 5: A number is divisible by 5 if it ends in 0 or 5.
