September 9, 2014

# Math Videos! Hooray!

## Open Number Line Addition and Subtraction

#### This method for addition and subtraction can be a life saver for students who are just having a tough time figuring out number sense when adding and subtracting. It’s not the most efficient method, but can be used to help struggling students connect the concrete concept to abstract. ## Multiplying 9s Tricks

### This is one of my very first videos, and I’m still really proud of it. So many of my adult friends watch this and say, “I wish I knew that when I was in school!” This video will teach you several neat “tricks” for multiplying 9 times any 1-digit number. ## Multiplying 8s Trick

#### There’s a multiplication trick for 8s, too. In my humble opinion, it’s not quite as crafty as the 9s trick, but it’s still pretty cool. ## Lattice Multiplication

#### Here is a method for multiplication of multi-digit numbers (anything larger than 9). This method is very confusing for some, but very easy for others. So try it out, but if you’re not sold, I’ve got other methods for multiplying these multi-digit numbers. ## Lattice Multiplication – The Sequel!

#### My dad actually made me realize the need for this sequel. Here is another example of how to use lattice multiplication with a 3-digit by a 2-digit number. ## How to do Grid Multiplication

#### When I have kids who don’t really ‘get’ the Lattice Multiplication method, I turn to Grid Multiplication. It’s generally, the same concept, but the format is a lot easier for most of my students to use. Grid Multiplication is a method of multiplying multi-digit (anything larger than 9) numbers. Very similar to “Partial Products” method or “Break Apart” methods. Try it! ## Partial Sums

#### This is another method to help students who are struggling with regrouping (borrowing, trading) when adding 2-digit or larger numbers. ## Divisibility Rules

#### Divisibility rules can come in so handy! I refer to them all the time when I’m tutoring. In this video I show you how you can quickly find out if a larger number is divisible by 2, 3, 4, 5, 6, 7, 8, 9 and 10. In all honesty, I don’t usually teach the rule for 7 and 8, but they do work, so…enjoy!  ## How to Add and Subtract Fractions with the Butterfly Method

#### This is a cool method for adding and subtracting fractions with unlike denominators. It’s not always as efficient as just finding a common denominator, but it does work. ## Big 7 Division with Decimals

#### Recently, a viewer asked if the “Big 7 division” method works for other types of division problems, too, i.e. decimals. That question prompted me to make this video. I give you: “Big 7 Division – the Decimal edition” Dun dun DUN! ## Prime Factorization with Factor Trees

#### Using a factor tree is one method of finding the prime numbers that make up a composite number, i.e. 2 and 3 are both prime numbers, and when you multiply them together you get the composite number of 6. See how easy? # Lowest Common Multiple

#### Up next is a video about how to find the LCM or Lowest Common Multiple. I show two different methods, but mainly focused on using the Factor Tree for the larger numbers. This is useful when you are working with adding and subtracting fractions with unlike denominators and need to find a common denominator. LCM is the same thing! Yipee! ## Greatest Common Factor

#### The GCF or Greatest Common Factor goes hand in hand with LCM – except that you’ll find this useful when trying to simplify fractions with really large numbers. Again, this method uses Factor Trees to find the GCF between 2 numbers. ## Fraction Percent and Decimal Conversion

### In this video, I show you how to convert between fraction, decimal and percent. All three forms can seem confusing, but I show you how to break each one down to its basic parts, which helps in understanding how to make sense of it all! ## Finding Percent in Word Problems

#### Ask a 6th grader to “find the percent of a number” and they will either look at you like you’ve got 7 heads or melt into a puddle on the floor from all the anxiety. In this video, I give actual word problems to show how to write sentences that can be converted into mathematical equations.  