You can tell by looking at it that the answer is 559. If you must, estimate 210 + 350 = 560
120+80
94
30+600+630
330 + 60 = 390
100+500=600
301
80+30
83+34
300 + 60
120+80
94
650 + 290 = 940
280 + 500 = 780
330 + 60 = 390
30+600+630
That equals 559. If you have to, estimate 210 + 350 = 560
100+500=600