Draw an array. Then write a fact family to describe your array
To draw an array, you need a grid made up of rows and columns. Here's an example of a small array:
1 2 3
4 5 6
In this array, there are 2 rows and 3 columns. The numbers in the array are arranged in a rectangular shape.
Now, to write a fact family that describes this array, we need to understand what a fact family is. In mathematics, a fact family consists of a group of related addition and subtraction facts using the same numbers.
Let's consider the numbers in our array:
1, 2, 3, 4, 5, 6
To form a fact family, we can choose three numbers from the array to be the "parent" numbers, and the other three numbers will be the "child" numbers.
Let's choose 2, 3, and 5 as the parent numbers:
Parent numbers: 2, 3, 5
To form addition and subtraction facts from these three numbers, we can pair up any two numbers and perform the operations:
Addition facts:
- 2 + 3 = 5
- 3 + 2 = 5
- 5 + 2 = 7
- 2 + 5 = 7
- 3 + 5 = 8
- 5 + 3 = 8
Subtraction facts:
- 5 - 2 = 3
- 5 - 3 = 2
- 7 - 2 = 5
- 7 - 5 = 2
- 8 - 3 = 5
- 8 - 5 = 3
So, the fact family that describes this array is:
2 + 3 = 5
3 + 2 = 5
5 + 2 = 7
2 + 5 = 7
3 + 5 = 8
5 + 3 = 8
5 - 2 = 3
5 - 3 = 2
7 - 2 = 5
7 - 5 = 2
8 - 3 = 5
8 - 5 = 3
There you have it!