[header] How to quickly multiply single digits by 9 [title] Remember that any number multiplied by 1 is the number itself. [step] No matter how tricky 9 is, it can't escape the fact that 1x9 will always equal 9. [title] Start simple and work your way up. 
[step] 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.