Nothing new to learn. Tens and ones keep working past 40.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Read it the same way
67 is 6 tens and 7 ones. The first digit is still the tens.
Ten tens
Ten tens is 100. It is the biggest number you can build with rods.
Nothing new happens at bigger numbers
Tens and ones behave the same at 78 as at 23. The rules were built to keep working, however far you go.
A hundred is ten tens
When ten bundles gather, they make one bigger bundle. The same trick, one level up.
Step 2: Try It Yourself
Tap and try it out.
Tens
0
Ones
67
That is ten or more. Bundle them and see what happens.
Step 3: Watch an Example
One step at a time.
Watch Ana Build 67
Ana builds 67 from loose ones.
- Step 1
She bundles ten ones, then again, and keeps going.
Step 4: Your Turn
Practice makes it stick.
Boxes of Crayons
Problem 1 of 1
Boxes hold ten crayons. 8 boxes and 4 loose. How many?
crayons
Tens and Ones to 100
1 of 3
How many tens are in 74?
2 of 3
5 tens and 9 ones is which number?
3 of 3
How many tens are in 100?
Step 5: Quick Check
Show what you know.
Question 1 of 2
How many ones are in 86?
Question 2 of 2
9 tens and 2 ones is which number?
What You Learned
- Every number to 100 is tens and ones.
- The first digit is the tens.
- Ten tens make 100.