From May 20 till June 3, 2012, get 20% off of all Math Mammoth downloads & CDs at Kagi store!
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Use the coupon code MAYSALE.
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Watch free percent videos online that match Math Mammoth materials! |
Free percent videos onlineFind here free online math videos on percent-related topics: what is percent, percentage of a number, discouns, sales tax, and percent of change. The videos are recorded in high-density (HD) and are viewable both here as well as at my Youtube channel. These videos are usable for students, teachers, and parents. You can use them...
The videos match the lessons in my book Math Mammoth Percent (Blue Series book), or the lessons in chapter 9 of Grade 5-B (Light Blue series), or chapter 6 in Grade 6-B (Light Blue series). In any of those books, you will get MANY more practice exercises, word problems, and puzzles than what are shown in the videos, and also some lessons that are not in covered in this set of videos.
PercentWhat is percent? I show how to change percents to fractions and vice versa.Percent of a NumberFind how to solve various percentages (percent of a number or quantity) using mental math. First, find 1% or 10% of the number, then you can find any percentage of the number.Percent of a number using decimalsI show how to find a percentage of a number, such as 8% of 5,000, using decimals. We change the word "of" into multiplication and the percent into a decimal. Then you just multiply using a calculator, mental math, or paper & pencil.What percentage / How many percent?To answer these kinds of questions (How many percent?/What percentage?), first write the PART being asked. You can replace the question in the problem with, "What part...?" Write that as a fraction. THEN, simply convert that fraction into a decimal and on into a percent.How to calculate discountsI explain how to calculate the discounted price when we know the discount percentage. I use mental math in many of the examples.How to calculate sales taxI show how to calculate the final price when you know the sales tax percentage. I show a few examples of using mental math and a few to be done with a calculator. I also show how to make this into a single calculation instead of first calculating the tax and then adding (which is two calculations).Percent of ChangeI explain how to calculate percent of change (percent change, percentage change) when the initial and final quantities are given. The main formula I use is to calculate the difference in the quantity divided by the original quantity. Then this fraction is written as a decimal, and as a percent.Percent of Change - ApplicationsI solve two word problems that involve percentage change - one having to do with percentage increase in area, and another with two separate discounts.Comparisons with PercentI explain how to solve problems that ask "How many percent / less / heavier / cheaper / taller is one thing than another?" We are comparing the two quantities, and we need to find the percentage difference between them. The general formula is: (difference of the two quantities / reference quantity). This gives us a fraction, which we then convert into a decimal and then into a percentage.The videos match the lessons in my book Math Mammoth Percent (Blue Series book), or the lessons in chapter 9 of Grade 5-B (Light Blue series), or chapter 6 in Grade 6-B (Light Blue series). In any of those books, you will get MANY more practice exercises, word problems, and puzzles than what are shown in the videos, and also some lessons that are not in covered in this set of videos.
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Math Teaching EmailsThis is a little "virtual" email course. You will receive: A package of 300 free worksheets and sample pages; 7 math teaching articles on various topics ranging from coherent curriculum to fractions; 2 emails discussing the books; My math newsletter (see archives).Note: You will FIRST get an email that asks you to confirm your email address. PLEASE check also your SPAM/JUNK folder for this confirmation email. |
Math Mammoth TourConfused about the different options? Take a 7-day virtual email tour around Math Mammoth! You'll receive: A package of over 300 free worksheets and sample pages; 7 individual emails on 7 subsequent days that answer the most commonly asked questions, including "What is the difference between all these different-colored series?" My math newsletter (see archives).This way, you'll have time to digest the information over one week, plus an opportunity to ask me personally which book would be right for your child or students. Note: You will FIRST get an email that asks you to confirm your email address. PLEASE check also your SPAM/JUNK folder for this confirmation email. |