Sometimes the ones add up to ten or more. Then you make a new ten.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Look what happens
18 + 16. Tens: 2 tens. Ones: 8 and 6 makes 14. That is too many loose ones.
Bundle them
Bundle ten of the 14 ones into a rod. Now 3 tens and 4 ones.
So 18 + 16 = 34.
Why a new ten appears
Ten loose ones cannot stay loose — that is what having only ten digits means. They must be bundled and moved across.
Carrying is just bundling
The little 1 you write is one bundle moving to the tens column. Nothing was invented; it was reorganised.
Step 2: Try It Yourself
Look at the loose ones before you bundle.
First number
and Second number
Altogether
Tens
2
Ones
14
18 + 16 = 34
There are 14 loose ones. Ten of them can become one more ten.
Step 3: Watch an Example
One step at a time.
Watch Ana Make a New Ten
Ana works out 18 + 16.
- Step 1
She counts the rods: 1 and 1 makes 2 rods.
Step 4: Your Turn
Practice makes it stick.
Two Jars
Problem 1 of 1
17 buttons in one jar and 15 in another. How many?
buttons
Bundle When You Need To
1 of 3
15 + 17 = ?
2 of 3
19 + 13 = ?
3 of 3
14 + 12 = ?
Find the Ones That Bundle
Try numbers where the ones reach ten, and numbers where they do not.
First number
and Second number
Altogether
Tens
2
Ones
11
12 + 19 = 31
There are 11 loose ones. Ten of them can become one more ten.
Step 5: Quick Check
Show what you know.
Question 1 of 2
16 + 17 = ?
Question 2 of 2
When do you need a new ten?
What You Learned
- Sometimes the ones add up to ten or more.
- Bundle ten of them into a new ten.
- Then say the answer as tens and ones.