Learn the terms factor, multiple, and divisible
Learn some basic terminology related to numbers and divisibility: What does it mean when one number is factor of another, when a number is a multiple of another, or a number is divisible by another.
This lesson is meant for 4th grade math. In the second part of the lesson we find out what prime numbers are. :).
See also
Remainder in division-related word problems — video lesson
Math Mammoth Division 2 — a workbook with worksheets and lessons for long division, remainder, factors, and primes
Math Mammoth Grade 4 curriculum