Q: Estimate the sum 646 plus 289 using compatible numbers?

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100+500=600

120+80

330 + 60 = 390

30+600+630

280+400

Related questions

300 + 60

280 + 500 = 780

100+500=600

That equals 559. If you have to, estimate 210 + 350 = 560

Not in this case.

301

80+30

83+34

120+80

650 + 290 = 940

330 + 60 = 390

30+600+630