How many times does the number 8 appear?

How many times does the number 8 appear?


8, 18, 28, 38, 48, 58, 68, 78, 98, 9 times
80 to 89, 10 times for ten, once for individual
9+10+1=20
So 20 times



Simple calculation of 81 + 9x91


81 + 9 × 91 = 9x9 + 9 × 91 = 9 (9 + 91) = 900 is correct, the teacher said in class