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

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300 + 60

280 + 500 = 780

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

Not in this case.

100+500=600

80+30

120+80

83+34

650 + 290 = 940

330 + 60 = 390

301

30+600+630

280+400

You can tell by looking at it that the answer is 559. If you must, estimate 210 + 350 = 560

What pair of addends forms compatible numbers in the expression 6.1+8.4+1.6?

8.4 and 1.6

300+60=360

210 + 350 = 560

Using real numbers, you cannot.

Input a variable.

8 plus 1 , minus 5, plus 7 + 13

14

85000 + 100000

Rounding both numbers to the nearest ten it is about 80

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