Step by step
The question
Question: what comes before 100?
What comes before 100?
We write it in numbers.
The box is the number we want.
= □, 100
1 Find 100
Here is a number line.
2 Go one step left
We land on 99.
3 Write the number
So before 100 comes 99.
= 99, 100
Careful!
Before 0 ones, the ones go back to 9.
The tens go down by 1.
Careful: 100 → 99: the ones go back to 9
4 Check
We check it the other way.
After 99 comes 100.
Yes!
It works.
After 99 comes 100
Let's look back.
First: find 100.
Then: go one step left.
Then: write the number.
Last: check.
Answer
= 99, 100