Step by step
The question
Question: write ninety-one as a number.
Write ninety-one as a number
1 Find the tens
ninety means 9 tens.
ninety → 9 tens
2 Find the ones
one means 1 one.
one → 1 one
3 Write the digits
9 goes in the tens.
1 goes in the ones.
So ninety-one is 91.
= 91
Careful!
We do not write 90 and then 1.
The 1 goes in the ones place.
Careful: not 901 ✗
4 Check
We read it back: 91 is ninety-one.
Yes!
It works.
91 → ninety-one
Let's look back.
First: find the tens.
Then: find the ones.
Then: write the digits.
Last: check.
Answer
= 91