Khan Academy: Arithmetic and Pre Algebra: Least Common Multiple (Lcm)

Prepare your classes for future work by reinforcing multiples and finding least common multiples. Learners see how to identify the least common multiple of a set of numbers. The instructor shows examples including a set of two and a set...

Learn how to multiply multi-digit numbers by watching a video showing several examples. Practice problems are available. [10:27]

This video explains how to subtract two mixed numbers by converting them to improper fractions. Practice problems are available. [3:59]

This video shows how to add and subtract fractions with like and unlike denominators. Practice problems are available. [9:49]

This video shows how to compare two fractions using a several methods. Practice problems are available. [7:08]

Give students detailed instructions on how to find the Least Common Multiple as well as practice with this thorough introductory instructional activity. Instructions for this instructional activity include an explanation of both guess...

This video shows several examples of addition with up to four-digit numbers. Practice problems are available. [8:57]

A video covering a review of subtraction using a number line, followed by subtraction of numbers up to three-digits by using borrowing and regrouping. Practice problems available. [18:26]

This video shows how to locate and plot a decimal number on a number line. Practice problems are available. [1:39]

This video explains how to divide two fractions. Practice problems are available. [8:59]