This video has a fun math riddle that you can share with your friends.  How can you use an empty 3 liter bottle and an empty 5 litter bottle to measure out exactly 4 liters of water.
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Algebra For Beginners:                                        https://www.youtube.com/watch?v=MHeirBPOI6w
Algebra 2 - Basic Introduction:                           https://www.youtube.com/watch?v=i6sbjtJjJ-A
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Basic Math Review:                                              https://www.youtube.com/watch?v=T_6Mq6PWoGc
Order of Operations:                                             https://www.youtube.com/watch?v=saTBf8AO4Ok
How To Evaluate Algebraic Expressions:          https://www.youtube.com/watch?v=-VCUcRtQjx8
Percentages Made Easy:                                     https://www.youtube.com/watch?v=WYWPuG-8U5Q
Fractions - Basic Introduction:                            https://www.youtube.com/watch?v=GvLIEiqxS6s
How To Solve Linear Equations:                         https://www.youtube.com/watch?v=7DPWeBszNSM
Linear Equations - Test Review:                          https://www.youtube.com/watch?v=Ft2_QtXAnh8
How To Factor Trinomials:                                   https://www.youtube.com/watch?v=-4jANGlJRSY
Cubic Polynomials:                                               https://www.youtube.com/watch?v=rnAKWPM-YBc
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Is The Ordered Pair a Solution?                           https://www.youtube.com/watch?v=QfWJDQrj4kU
Systems of Linear Equations - 2 Variables:       https://www.youtube.com/watch?v=oKqtgz2eo-Y
Systems of Equations - Fractions & Decimals: https://www.youtube.com/watch?v=jlddJQ1qYDU
One Solution, No Solution or Many Solutions? https://www.youtube.com/watch?v=bq5gDsEdN3Q
Systems of Equations - Substitution Method:  https://www.youtube.com/watch?v=cblHUeq3bkE
Solving Systems of Equations By Graphing:     https://www.youtube.com/watch?v=Pd4hwS8qHms
Systems of Linear Equations - 3 Variables:       https://www.youtube.com/watch?v=0JQeo0yC9OQ
Systems of Equations - Word Problems:           https://www.youtube.com/watch?v=YgtidDkjJ9M
Math Riddles:                                                          https://www.youtube.com/watch?v=F2G2Z9LGyyY
Time and Work Problems:                                    https://www.youtube.com/watch?v=zUE59CNlFsI
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How To Solve Simple Quadratic Equations:      https://www.youtube.com/watch?v=-KWsS2FZVTA
The Zero Product Property:                                  https://www.youtube.com/watch?v=J7MjMM_mi4k
Solving Quadratic Equations By Factoring:       https://www.youtube.com/watch?v=qeByhTF8WEw
How To Factor Difficult Quadratic Equations:   https://www.youtube.com/watch?v=VG1luiL_INQ
Solving QE By Completing The Square:              https://www.youtube.com/watch?v=WOb25i8FBBw
Solving QE With Exponents:                                 https://www.youtube.com/watch?v=uO4dT9Dp7lI
How To Calculate The Discriminant:                  https://www.youtube.com/watch?v=6fU9ZgwbU74
Writing Quadratic Equations:                               https://www.youtube.com/watch?v=SB6eCyG4GEA
Standard Form to Vertex Form:                           https://www.youtube.com/watch?v=pf9LkX8hpTQ
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Graphing Quadratic Functions:                            https://www.youtube.com/watch?v=H8OQtxSRe_k
How To Find The Axis of Symmetry:                   https://www.youtube.com/watch?v=tyzd4VujaqY
Graphing Quadratic Functions - Vertex Form:   https://www.youtube.com/watch?v=OHH7fX_M8Ns 
Graphing QF in Standard Form:                           https://www.youtube.com/watch?v=uYNKJWFYh7k
Maximum and Minimum Word Problems:         https://www.youtube.com/watch?v=d5YktqR-4FU
Solving Equations In Quadratic Form:                https://www.youtube.com/watch?v=eWjixwGK3YM
Systems of Quadratic Equations:                        https://www.youtube.com/watch?v=rq5AjFs95qw
Systems of Nonlinear Equations:                        https://www.youtube.com/watch?v=JPdLEaxlnZQ
Quadratic Inequalities:                                          https://www.youtube.com/watch?v=_gWjLKsFOPE
Quadratic Equations - Test Review:                    https://www.youtube.com/watch?v=fFFA7Q4eVuY
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Algebra 1 Review Study Guide:                            https://www.youtube.com/watch?v=TbJ5gqLRpeM
Algebra Final Exam Review:                                 https://www.youtube.com/watch?v=U0Y8nSmEpNM
Precalculus Final Exam Review:                          https://www.youtube.com/watch?v=Tj-V6KnwM5w