Bundling changes how blocks are grouped. It never changes how many.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Three ways to show 34
34 ones. Or 2 tens and 14 ones. Or 3 tens and 4 ones. All the same amount.
Later this helps you take ones away when there are not enough.
Different builds, same number
2 tens and 5 ones, or 1 ten and 15 ones. Both are 25. Regrouping changes the arrangement, never the amount.
Why anyone would want the odd version
When you subtract and the ones are too few, you deliberately trade a ten for ten ones. This lesson is that trade, met early.
Step 2: Try It Yourself
Bundle and unbundle. The number at the top never moves.
Tens
0
Ones
34
That is ten or more. Bundle them and see what happens.
Step 3: Watch an Example
One step at a time.
Watch Leo Show 34
Leo starts with 34 loose ones.
- Step 1
He bundles once. Now 1 ten and 24 ones.
Step 4: Your Turn
Practice makes it stick.
Two Shelves
Problem 1 of 1
Ana has 2 tens and 14 ones. How many is that?
blocks
Same Number, Other Way
1 of 3
1 ten and 17 ones is which number?
2 of 3
2 tens and 12 ones is which number?
3 of 3
25 has 1 ten. How many ones are left?
Step 5: Quick Check
Show what you know.
Question 1 of 2
2 tens and 16 ones is which number?
Question 2 of 2
Does bundling change how many you have?
What You Learned
- One number can be shown in many ways.
- 34 is 3 tens 4 ones, or 2 tens 14 ones.
- Grouping changes. The amount does not.