The numbers 9 plus 9 equal the number 18. If 9 elephants perform in a circus along with 9 lions, you have an extremely interesting show, plus the total number of performing animals equals the number 18. The number 9 is greater than the number 8 and less than the number 10.

If 9 plus 9 equals 18, then it follows that 18 minus 9 equals 9. If you take away 9 toys from 18 toys, you still have 9 remaining toys. In every case, whenever you add the number 9 to another number 9, you always have an end result that equals the number 18.

9 plus 9 or 9 + 9 is equal to 18. This can be derived through multiple means of course, but 9 + 9 simply states:

(1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1) + (1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1) = 18

You can even do the counting on your fingers and your toes to arrive at the final answer.

Optionally you may write 9 + 9 as 9 * 2 or 2 * 9 which in all cases will arrive at the answer 18.

I hope this answers your question and allows you more easily solve similar problems in the future. Good luck!

From a numerological perspective, when any number is multiplied by nine, the answer is nine.

In the case of 9+9, nine is multiplied by two.

9x2=18.

1+8= 9

Likewise, 9x5=45

4+5=9

12x9=108

1+0+8=9

9+9=18

1+8=9

9+9=18. 9 is added to the number 9.

It is similar to 9*2=18, where 9 is multiplied twice.