You would round 313 to 300 and 489 to 500 and multiply 300 by 500. You should get 150,000. The real answer should be near 150,000.
4
35 x 489 = 17115
490 and 90
Take 80% of 500 and you get 400
A good estimate for driving time is about 60 miles per hours.
489 squared is 239,121.
375 + 489 = 864
1, 3, 163, 489
489 - 2 = 487
1, 3, 163, 489
30% of 489 is 146.7
489 + 689 = 1178
Divide 489 by 7.