Goal:
Goal:
Goal: Use doubles addition facts to create doubles subtraction facts.
Hands-On
We can add and subtract doubles facts easily when we understand how they are related. Look at this doubles fact:
4 - 2 = 2
The whole is 4, and the part is 2.
What addition sentence uses the same whole and part?
Sorry, this addition sentence does not use the same parts and whole.
That’s right! This addition sentence uses the same parts and whole.
Sorry, this addition sentence does not use the same parts and whole.
You got # out of # correct.
Click the
Retry button for another attempt.
You got a perfect score. Great job!
These subtraction and addition facts are related because they have the same whole and parts. You can clearly see that the parts and the whole match when we put them in part-part-whole charts, too!
2 + 2 = 4
4 - 2 = 2
2 + 2 = 4
4 - 2 = 2
When you are subtracting doubles facts, the parts are the same. See how the parts in this subtraction sentence are the same number?
4 - 2 = 2
We can add and subtract doubles facts easily when we understand how they are related. Let’s practice relating doubles facts in the worksheet below.
Click the link to find and print your worksheet. You will need 20 counters and a pencil. Use the counters to first create the addition doubles fact provided. Then, create the subtraction doubles fact that uses the same parts and whole! When you are done, turn in your assignment to your teacher with your Weekly Written Work.
Add and Subtract DoublesUsing the whole-part-part chart, get out your counters to show the doubles subtraction sentence: 10 - 5 = 5. When finished, click to reveal the correct answer.
The parts in this subtraction sentence are both 5, so there should be 5 counters in each part box! Then, the whole here is 10 so we should see 10 counters in the whole box. Does your whole-part-part chart match the one above?
Using the whole-part-part chart, get out your counters to show the doubles subtraction sentence: 16 - 8 = 8. When finished, click to reveal the correct answer.
The subtraction sentence has the same two parts because it is a doubles fact! Each part box should have 8 counters. Then, the whole is the biggest number, so there are 16 counters needed in the whole box! Does your chart match?
