Add Double Digits
Goal:
Goal:
How do we add single and double digits?
Let's learn how to add a double-digit number (such as 12) to a single-digit number (such as 7). Let's add 12 + 7. Click through the slideshow to see two different ways to set this up.
We can use column addition. Begin by writing one number below the other, like this:
The tens and ones digits get their own columns, like this:
Start by adding the ones digits, like this:
Then add the tens digit column, like this:
And you have your answer! 12 + 7 = 19
Another method to try is using your ten frames.
It will help to "join" the numbers in the ten frames, like this:
It's easier to see the answer is 19.
Solve the equation below using column addition or by making your own ten frames. Then, select the correct answer.
17
Correct!
19
Incorrect. Try adding the ones column again!
15
Incorrect. Try adding the ones column again!