Whether you’re just starting out in an algebra class, or taking advanced calculus, Firefly Lectures will help you quickly build your math skills with simple, step-by-step lessons.
Devin Henson is a full-time math instructor on the college level, runs a successful online tutoring company, and is the founder of Firefly Lectures which produces some of the highest quality math videos online. After finishing undergrad in 3 years, Devin went on to earn a Masters Degree in Mathematics from USC, and now teaches mathematics full time. Devin has earned multiple teaching excellence awards over the last few years.
All Lessons by Firefly Lectures
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2 minFREEMath lessonFree2 CQ
Blow your friends' minds with a math algorithm that allows you to take any date in history and determine the exact day of the week for that date!
with Firefly LecturesBlow your friends' minds with a math algorithm that allows you to take any date in history and determine the exact day of the week for that date!
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6 minMath lesson4 CQ
In this second lesson of a series on how to compute the day of the week for any calendar date in history, learn to calculate day codes using modular arithmetic.
with Firefly LecturesIn this second lesson of a series on how to compute the day of the week for any calendar date in history, learn to calculate day codes using modular arithmetic.
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3 minMath lesson2 CQ
In this third lesson of a series on computing the day of the week for any date in history, discover a simple mnemonic device for remembering day codes.
with Firefly LecturesIn this third lesson of a series on computing the day of the week for any date in history, discover a simple mnemonic device for remembering day codes.
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7 minMath lesson4 CQ
In this fourth lesson of a series on how to compute the day of the week for any calendar date in history, learn how to determine the number code for any month.
with Firefly LecturesIn this fourth lesson of a series on how to compute the day of the week for any calendar date in history, learn how to determine the number code for any month.
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17 minMath lesson9 CQ
In this fifth lesson of a series on how to compute the day of the week for any calendar date in history, learn about year codes and how to calculate them.
with Firefly LecturesIn this fifth lesson of a series on how to compute the day of the week for any calendar date in history, learn about year codes and how to calculate them.
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14 minMath lesson8 CQ
In this sixth lesson of a series on how to compute the day of the week for any date in history, learn about year codes so you can account for other centuries.
with Firefly LecturesIn this sixth lesson of a series on how to compute the day of the week for any date in history, learn about year codes so you can account for other centuries.
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11 minMath lesson6 CQ
In this seventh and final lesson of a series on computing the day of the week for any date in history, work a few examples on paper or in your head!
with Firefly LecturesIn this seventh and final lesson of a series on computing the day of the week for any date in history, work a few examples on paper or in your head!