Write the next sentence in this paragraph:

How to quickly multiply single digits by 9
Remember that any number multiplied by 1 is the number itself.
No matter how tricky 9 is, it can't escape the fact that 1x9 will always equal 9.
Start simple and work your way up.
Don't try to multiply 9x9 before you learn 9x2 because it is a lot easier to think of math like a ladder. You should take each step to the top because if you try to skip steps you may just fall back and have to start over.