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divisibility rules
summary
the content provides a comprehensive guide on divisibility rules for numbers 2, 3, 4, 5, 6, and 9, essential for efficiently solving mathematical problems without performing full division.
- divisibility by 2 and 5 can be determined by examining the last digit of the number.
- divisibility by 4 depends on the last two digits of the number forming a number divisible by 4.
- for divisibility by 3 and 9, the sum of all digits in the number must be divisible by 3 or 9, respectively.
- a number is divisible by 6 if it meets the criteria for divisibility by both 2 and 3.
- understanding and applying these rules can significantly simplify the process of determining divisibility, especially for large numbers.
chapters
00:00
divisibility by 2 and 5
03:11
divisibility by 3 and 9
