Understanding Square Roots
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers Understanding multiplication through area models.
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers Understanding place value 1 exercise.
Unit Conversion with Fractions
Figuring out Usain Bolt's average speed over 100m when he broke the world record in 2009
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers Visualizing equivalent fractions.
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers We must have eaten more pie!.
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers What fraction of spider eyes are looking at me?.
Thinking about why dividing by zero is left undefined
Understanding why lattice multiplication works
Intuition as to why subtracting a negative number is equivalent to adding the absolute value of that number
Using the repeated addition model of multiplication to think about multiplying negative numbers
Why negative number products are defined in the way they are.
Why you can add the digits to see if something is divisible by 3
Why you can test divisibility by 9 by just adding the digits
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers Writing a decimal to represent a quantity.
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers Writing numerical inequalities exercise.
This video is from the Khan Academy subject of Math on the topic of Arithmetic and pre-algebra and it covers Writing out a decimal in words.