Multiplying 3's from Mathmagical on Vimeo.
By our definition, a combination strategy is using two or more multiplication strategies in conjunction with one another to solve a problem. Multiplying 3’s from Multiplying Time is a great example of a combination strategy. The strategy is to double first then add the number once again.
So, for example, 3 x 1 = 1 doubled, plus 1. Or, 3 x 2 = 2 doubled, plus 2. Again, utilization of this type of strategy will help students with multiplication of numbers far beyond the 12 x 12 multiplication table. Let’s put that to the test…
3 x 19 = 19 doubled, plus 19. Do you know the answer? If you answered 57 give yourself a pat on the back. Let’s try another one. 3 x 31 = 31 doubled, plus 31. The first person to leave a comment and include the correct answer in their comment is eligible to buy up to 10 Multiplying Time! CD’s direct from Mathmagical for $5.99 each. Tax and shipping included.