What multiplication fact can be found by using the arrays for 2x9 and 5x9?

2 x 9 = 18 and 5 x 9 = 45

with 2 x 9, you can make 2 rows of 9 dots for an array.

with 5 x 9, you can make 5 rows with 9 dots for an array.

Well 2x9=18 and 5x9=45

2 rows of 9 dots and that will give 18 and 9 rows of 2 dots that will give you 18

5 rows of 9 dots and that will give 45 and 9 rows of 5 dots that will give you 45