When the ones reach ten, you bundle. That has not changed either.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Check the ones first
38 + 25. Ones: 8 and 5 makes 13. That is more than ten.
Bundle ten of them. 5 tens becomes 6 tens, with 3 ones left.
Write it down
38 + 25 = 63. Saying what you did helps you check it.
The same bundling rule
Ten loose ones become one ten and move across. It is identical to what you did within forty, on bigger numbers.
Look at the ones first
Adding the ones tells you immediately whether a new ten is coming. Deciding that first stops mistakes later.
Step 2: Try It Yourself
Count the loose ones before you bundle.
First number
and Second number
Altogether
Tens
5
Ones
13
38 + 25 = 63
There are 13 loose ones. Ten of them can become one more ten.
Step 3: Watch an Example
One step at a time.
Watch Leo Bundle Again
Leo works out 38 + 25.
- Step 1
He counts the rods: 3 and 2 makes 5 rods.
Step 4: Your Turn
Practice makes it stick.
Two Piles of Books
Problem 1 of 1
27 books on one shelf and 46 on another. How many?
books
Bundle If You Need To
1 of 3
46 + 27 = ?
2 of 3
35 + 28 = ?
3 of 3
42 + 31 = ?
Find the Ones That Bundle
Try pairs that need a new ten, and pairs that do not.
First number
and Second number
Altogether
Tens
5
Ones
13
24 + 39 = 63
There are 13 loose ones. Ten of them can become one more ten.
Step 5: Quick Check
Show what you know.
Question 1 of 2
29 + 34 = ?
Question 2 of 2
What do you check before adding the tens?
What You Learned
- When the ones reach ten, bundle them.
- The new ten joins the other tens.
- Write the answer down and check it.