This math video tutorial explains how to perform simple addition, subtraction, multiplication, and long division. Here is a list of topics:

Percentages Made Easy: https://www.youtube.com/watch?v=WYWPuG-8U5Q
Percentage, Base, & Rate Problems: https://www.youtube.com/watch?v=qstt3dR_iEw
Part, Whole, & Percent Proportion: https://www.youtube.com/watch?v=Uo8HgcyfRFI
Percent Increase & Decrease Problems: https://www.youtube.com/watch?v=T6-0MwmCpE8
Percentage Word Problems: https://www.youtube.com/watch?v=kjpwBu6DmkM
Percent Error: https://www.youtube.com/watch?v=JbEo46uV6d4
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Sales Price After Discount: https://www.youtube.com/watch?v=o4H6adh7vmo
Sales Tax, Discount, & Original Price: https://www.youtube.com/watch?v=TRlC8lqkhT4
How To Calculate The Original Price: https://www.youtube.com/watch?v=6zRNXYRRv-k
Unique Percentage Problem: https://www.youtube.com/watch?v=VLFvK3xhLxA
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Basic Math Quick Review: https://www.youtube.com/watch?v=T_6Mq6PWoGc
Percent to Decimal Conversion: https://www.youtube.com/watch?v=u5WkQQB70qo
Percent to Fraction Conversion: https://www.youtube.com/watch?v=5ZHccsyr_JI
Fractions - Basic Introduction: https://www.youtube.com/watch?v=GvLIEiqxS6s
Unit Rates, Ratios, & Proportions: https://www.youtube.com/watch?v=s0RBRkehzwo
Ratios and Proportions - Word Problems: https://www.youtube.com/watch?v=JOZSFwuyqok
Ratios and Proportions - SAT Math: https://www.youtube.com/watch?v=Y4fgwWEGQlg
Ratios and Proportions - Mean & Geometry: https://www.youtube.com/watch?v=tFCrFa0mDi4
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Acid Mixture Word Problems: https://www.youtube.com/watch?v=e2FAAMlAJ3c
Translating Words to Algebraic Expressions: https://www.youtube.com/watch?v=QEnFIgN8UBw
Words to Equations - More Problems: https://www.youtube.com/watch?v=VjPX-XlN7Ok
Consecutive Integers Word Problems: https://www.youtube.com/watch?v=hPnoxAf60c0
Age Word Problems - Past, Present, Future: https://www.youtube.com/watch?v=7x7Hl9ztYbk
Upstream and Downstream - Problems: https://www.youtube.com/watch?v=nW9WDlcicxE
Distance, Rate, & Time - Word Problems: https://www.youtube.com/watch?v=r4ff6KjPKHE
Time and Work - Word Problems: https://www.youtube.com/watch?v=zUE59CNlFsI
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Arithmetic Sequences - Word Problems: https://www.youtube.com/watch?v=XZJdyPkCxuE
Geometric Sequences - Word Problems: https://www.youtube.com/watch?v=zRKZ0-kOUZM
Intersection and Union of Sets: https://www.youtube.com/watch?v=xZELQc11ACY
Venn Diagram - Word Problems: https://www.youtube.com/watch?v=32iNIZJ2dI4
Probability With Marbles - Word Problems: https://www.youtube.com/watch?v=UORztmWGY6Q
Expected Value - Word Problems: https://www.youtube.com/watch?v=b6VK2VPMXNI
Standard Normal Distribution Problems: https://www.youtube.com/watch?v=CjF_yQ2N638
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Simple Interest - Word Problems: https://www.youtube.com/watch?v=NCYNXkbTTUo
Compound Interest Word Problems: https://www.youtube.com/watch?v=Hn0eLcOSQGw
Interest Compounded Continuously: https://www.youtube.com/watch?v=Ln97Hd7AiDc
Future Value of an Annuity Math Problem: https://www.youtube.com/watch?v=bcuXY8WkjF4
Population Growth Word Problems: https://www.youtube.com/watch?v=k4LLdFFLRmQ
Bacteria Growth Word Problems: https://www.youtube.com/watch?v=NToXdbd7sRU
Exponential Growth & Decay Problems: https://www.youtube.com/watch?v=e5nwJKUc3bA
Logistic Growth Word Problems: https://www.youtube.com/watch?v=JgMvB22XQs0
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Angle of Elevation Word Problems: https://www.youtube.com/watch?v=uyKvSe6Ltgs
Bearings and Direction - Word Problems: https://www.youtube.com/watch?v=jyi5zW8mavs
Bearing and Navigation Word Problems: https://www.youtube.com/watch?v=cSKAqfGXOPI