202
860
960 + 330 = 1290
300 x 60 = 18000
300 + 60
330 + 170 = 500
300+60=360
330 + 60 = 390
For an "estimate", I would suggest rounding it to one or two significant digits.
The factors of 329 are: 1, 7, 47, 329.
factors of 329 - 1, 7, 47, 329
3.29 = 329/100 and simplifies to: 3 29/100