Step by step
The question
Question: what comes before 70?
What comes before 70?
We write it in numbers.
The box is the number we want.
= □, 70
1 Find 70
Here is a number line.
2 Go one step left
We land on 69.
3 Write the number
So before 70 comes 69.
= 69, 70
Careful!
Before 0 ones, the ones go back to 9.
The tens go down by 1.
Careful: 70 → 69: the ones go back to 9
4 Check
We check it the other way.
After 69 comes 70.
Yes!
It works.
After 69 comes 70
Let's look back.
First: find 70.
Then: go one step left.
Then: write the number.
Last: check.
Answer
= 69, 70