HOW DO YOU ADD AND SUBTRACT ?

Question

TO ADD AND SUBTRACT YOU HAVE POSTIVE AND NEGATIVE NUMBER LIKE THIS 2+5 = 7 EASY COUNT ON YOUR FINGER DONT COUNT THE 2 JUST SAY 3 4 5 6 7 IS THAT FIVE? NUMERS RIGHT ITS EASY JUST COUNT DO THIS ONE. 9+10 REMEMBER COUNT START FROM 10!!!!!!. = 19 LIKE THIS 10 11 12 13 14 15 16 17 18 19 THATS TEN NUMBERS .TRY THIS HARD ONE !!!!. 20+13 = 33 IT TOO MUCH NUMERS TO FILL MY SPACE SO THATS HOW YOU DO IT .

Answer 1

yu shood memorize ansers tu all adds numbers 1 thru 12 . . .

so yuno anser in 0.3 sekond & dont hafta thank.

Then yu kan du bigger numbers 1 step at a time