This video lecture series on Developmental Math by Khan Academy provides developmental math examples from the Monterey Institute. These start pretty basic and would prepare a student for the Worked Examples in Algebra course lectures.....
Writing a number in expanded form is a free educational video by Khan Academy.It helps students in grades 5 practice the following standards 4.nbt.a.2.
1. 4.nbt.a.2 : Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form. Compare two multi-digit numbers based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons. (Grade 4 expectations in this domain are limited to whole numbers less than or equal to 1,000,000.).
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