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Math videos for division, long division, factors, divisibility, and primes (grades 3-5)

Find here free online math videos on division, long division, factors, divisibility, and primes, meant for 3rd, 4th, and 5th grades.


Division with single-digit divisor (3rd grade)

These videos match the topics in Math Mammoth Division 1 worktext (Blue Series).

The connection between multiplication and division

Divide evenly into groups — basic concept of division

Division versus multiplication word problems

Division by zero

Division with remainders


Long division (4th grade)

These videos match the topics in Math Mammoth Division 2 worktext (Blue Series).

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The order of operations plus writing simple expressions

The remainder, part 1

The remainder, part 2 – we learn to write division with a different symbol and learn about the remainder in word problems

How to teach long division

Remainder problems – word problems involving long division with a remainder

Concept of average

Find fractional parts with division


Long division (5th grade)

These videos match the topics in Math Mammoth Multiplication & Division 3 worktext (Blue Series).

Review: Multiplication and Division – simple equations, bar models, terminology

Long division with a two-digit divisor

Long division as continued (repeated) subtraction


Divisibility, factors, and primes (grades 4-6)

These videos match the topics in Math Mammoth Division 2 and Math Mammoth Multiplication & Division 3 worktexts (Blue Series).

Divisibility (and factors & multiples)

An introduction to prime numbers

Finding factors

Divisibility rules

Prime factorization using factor trees

The sieve of Eratosthenes (for finding primes)

Prime factorization

The greatest common factor

The least common multiple


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