What number is that?

What number is that?
A famous past president of the USA, Abraham Lincoln,
once started a speech with a number. He said:
“Four score and seven years ago…”
A score is another name for twenty. What number did
Abraham Lincoln begin his speech with?
1. Abraham Lincoln is saying a number in a funny way. What is his number?
2. Which part of Lincoln’s number is different to the way that we say our
numbers?
3. What could we use to represent twenty, a score?
4. What would four score, four twenties, look like?
5. What does four score and seven, four twenties and seven, look like?
6. What is four score and seven in our numbers?