Math Mammoth Introduction to Fractions contains fraction-related material suitable for approximately grades 2-4. This material does not include division or multiplication of fractions, nor adding unlike fractions.
The lessons are mostly simple, introductory lessons to various fraction topics. The topics covered are on a simple level, illustrated with pictures, and have small denominators. The presentation relies on the usage of pictures on a very concrete level.
The topics covered are, one-half and fourth parts, the concept of a fraction, the concept of a mixed number, adding and subtracting like fractions, adding and subtracting mixed numbers with like fractional parts, equivalent fractions with pictures, comparing fractions, and finding fractional part of a whole using division.
The lessons proceed so that the first two are suitable for second grade, and the rest are suitable for third or for fourth grade.