18. I will write.
One and One More Equal Two.
19. Now I will write part of this in the Language of Arithmetic. I write the first One thus, 1; then the other One thus, 1. Afterward I write, for the word More, thus, +, placing the + between 1 and 1, so that the whole stands thus: 1 + 1. As I write, I say, One and One more.
20. Each of you write 1 + 1. Read what you have written.
21. This +, when written between the 1s, shows that they are to be put together, or counted together, so as to make 2.
22. Because + shows what is to be done, it is called a Sign. If we take its name, Plus, and the word Sign, and put both words together, we have Sign Plus, or Plus Sign. In speaking of this we may call it Sign Plus, or Plus Sign, or Plus.
23. 1, 2, +, are part of the Language of Arithmetic.
Write the following in the Language of Arithmetic:
24. One and one more.
25. One and two more.