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Number Theory and Divisibility

How do I know if a number is divisible by another? This concept covers divisibility, factors and multiples. We also learn about prime and composite numbers.
The concept is broken into smaller topics, which makes it easier and much more fun for students. The topics are listed below:-
Common Factor and GCF
In this topic, we learn to find the GCF of two numbers and solve the related word problems.
Video Lesson for Common Factor and GCF
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Divisibility
In this topic, we learn to check the divisibility of numbers by 2, 3, 4, 5, 6, 9, and 10 and the word problems related to it.
Video Lesson for Divisibility
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Practice Problems for Divisibility
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Primes and Composites
In this topic, we learn to find if a number is prime, composite or neither. We also learn to find the prime factorization of a composite number.
Video Lesson for Primes and Composites
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