Multiplication strategies
Topic Notes
In this lesson, we will learn:
- Understanding multiplication using arrays
- Representing a product as either: (1) a smaller product and a sum, or (2) a bigger product and a difference
- Tips and tricks for memorizing the 9 × multiplication table facts
Notes:
- Multiplication is just repeated addition

- Multiplication facts can be shown in an array model with circles/dots
- Using the array model, it shows that multiplication facts can be broken into groups of smaller multiplication facts:

- Using the same array model, we can find the next multiplication fact by adding another row:

- Therefore, a product can be found as a smaller product and a sum

- Or, it could be found as a bigger product and a difference

- The 9 × multiplication tables can be memorized using your fingers!
- Notice that the first ten multiples of 9 are mirrored after the 5-digit in 45
- Ex. 9, 18, 27, 36, 45 54, 63, 72, 81, 90