number sence. what multiplication fact can be found by using the arrays for 2x9 and 5x9 ?
Your question is unclear. Is it about matrices? Just looking at a matrix (array) does not reveal any "facts" except for that the matrix elements (numbers) are.
A 2 x 9 matrix cannot be multiplied with a 5 x 9 matrix. You CAN multiply a 2 x 9 and a 9 x 5 matrix.
To find the multiplication facts for 2x9 and 5x9 using arrays, you can create arrays with 2 rows and 9 columns for 2x9, and 5 rows and 9 columns for 5x9.
For 2x9:
- Draw 2 rows with 9 columns each.
- Count the total number of squares/units in the array, which will give you the product of the two numbers: 2x9 = 18.
For 5x9:
- Draw 5 rows with 9 columns each.
- Count the total number of squares/units in the array, which will give you the product of the two numbers: 5x9 = 45.
Therefore, the multiplication facts for 2x9 and 5x9 are:
- 2x9 = 18
- 5x9 = 45.
To find the multiplication fact that can be found by using the arrays for 2x9 and 5x9, you need to understand the concept of multiplication and visualize the arrays.
1. First, envision the array for 2x9. This means you have 2 rows and 9 columns. To imagine it visually, draw 2 rows with 9 circles in each row.
Row 1: ● ● ● ● ● ● ● ● ●
Row 2: ● ● ● ● ● ● ● ● ●
2. Next, think about the array for 5x9. This means you have 5 rows and 9 columns. Visualize it by drawing 5 rows with 9 circles in each row.
Row 1: ● ● ● ● ● ● ● ● ●
Row 2: ● ● ● ● ● ● ● ● ●
Row 3: ● ● ● ● ● ● ● ● ●
Row 4: ● ● ● ● ● ● ● ● ●
Row 5: ● ● ● ● ● ● ● ● ●
3. Now, you need to count the total number of circles in both arrays. In the array for 2x9, there are a total of 18 circles. In the array for 5x9, there are a total of 45 circles.
4. To find the multiplication fact, you should multiply the number of circles in each array. In this case, multiply 18 (from 2x9) by 45 (from 5x9).
18 x 45 = 810
Therefore, the multiplication fact that can be found by using the arrays for 2x9 and 5x9 is 810.