Grade 4,5 Video: Add Subtract Fractions Using LCM
02/12/2010 • Students learn to add or subtract fractions using the least common denominator, which is the least common multiple
Grade 4 Video: Multiplying Mutli-Digit Numbers
02/12/2010 • Working our way up to multiplying multiple-digit numbers with each other . More examples.
Grade 4,5 Video: Multiply Multi Digit Numbers
02/12/2010 • Good to review multiplying large numbers. 2 examples of multiplying a 3 digit number times a 2 digit number. 1...Read More
Grade 4,5,6 Video: History of Mathematics
02/12/2010 • Great cartoon on the history of mathematics. Worth watching.
Grade 4,5,6 Video: Superfast Way of Multiplying Any 2 digit numbers.
02/12/2010 • Why does it work ? One could use (a+b)(c+d) ... to explain it