Krista King Math
Signed Numbers, Multiplication
Explore patterns in multiplying with positive and negative numbers. Viewers learn the rules for multiplying two signed numbers and then watch as these rules are extended to multiplying with more than two numbers.
Curated OER
How Do You Multiply a Three-Digit Number by a One-Digit Number?
The teacher gives a very thorough explanation of how to set up and multiply numbers vertically. She emphasizes place value and where the numbers go when you multiply them (carrying).
Curated OER
How Do You Subtract Fractions with Different Denominators?
Combining fractions with unlike denominators. Wait! You can't do that! You have to have common denominators to combine the numerator of fractions. Here's a quick review of changing the denominator by multiplying each fraction by that...
Curated OER
What's Scientific Notation?
The instructor clarifies how to write numbers in scientific notation. There are a couple of criteria that must be followed in order to be able to write either a very small number, or a very large number, with lots of zeros, in scientific...