what multiplication fact can be found by using the arrays for 2X9 and 5X9?
To find the multiplication facts by using arrays, we need to understand the concept of arrays. An array is a rectangular arrangement of objects in rows and columns. In the context of multiplication, an array can help us visualize the multiplication process.
For example, to find the multiplication fact of 2x9 using arrays, we can create an array with 2 rows and 9 columns:
```
X X X X X X X X X
X X X X X X X X X
```
As you can see, there are 2 rows with 9 X's in each row. Counting the total number of X's gives us the answer: 2x9 = 18.
Similarly, for 5x9, we can create an array with 5 rows and 9 columns:
```
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
```
Counting the total number of X's gives us the answer: 5x9 = 45.
Therefore, the multiplication facts found by using the arrays for 2x9 and 5x9 are 18 and 45, respectively.