Give me an example. How to write a fact family with a sum of seven- teen?
To write a fact family with a sum of seventeen, we need to create a set of four different number sentences, including two addition equations and two subtraction equations. The numbers used in the fact family should be related and provide a sum of seventeen when added together.
Let's break it down step by step:
Step 1: Choose three numbers that add up to seventeen.
For this example, we can choose 10, 6, and 1 as our three numbers. These numbers can be arranged in different ways to create our fact family.
Step 2: Write two addition equations.
First, write an addition equation using the three chosen numbers:
10 + 6 + 1 = 17
Next, rearrange the numbers and write another addition equation:
1 + 10 + 6 = 17
Step 3: Write two subtraction equations.
To create the subtraction equations, use the same three numbers and subtract them in different orders.
Subtraction equation 1:
17 - 10 = 7
This equation shows the difference between the sum (17) and one of the addends (10) being equal to the remaining number (7).
Subtraction equation 2:
17 - 6 = 11
Similarly, this equation shows the difference between the sum (17) and a different addend (6) being equal to another remaining number (11).
So, the fact family with a sum of seventeen can be written as:
10 + 6 + 1 = 17
1 + 10 + 6 = 17
17 - 10 = 7
17 - 6 = 11
Remember, fact families are sets of related addition and subtraction equations that involve the same numbers. In this example, we used 10, 6, and 1 to create different equations with a sum of seventeen.