20 times
73
100 times
19 times.
11 times
20 times
No, many more times over the millennia that people have used arithmetic.
The number 7 occurs once. The digit 7 occurs 20 times.
150 times ...
ten times
24
444
963
73
19.
30 times because when you count up in tens this is the answer
It appears 25 times.
In scientific notation, we have 4.8 x 100 g since the decimal place occurs between the leading nonzero digit and the adjacent digit.