The number 78,909 rounded to the nearest ten thousand would be 79,000. This is taught in math.
800
To the nearest hundred thousand, 100000
10.00
789 = 7890 tenths.
789 + 211 = 1000
To the nearest ten, 790 To the nearest hundred, 800
789 is a whole number.
seven hundred thousand seven hundred and 789 I think
To one significant number, 800
1000
790
0