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Q: Can you show us some working for this compatible numbers to estimate 212 plus 347?

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80+30

120+80

94

83+34

300 + 60

650 + 290 = 940

330 + 60 = 390

30+600+630

280 + 500 = 780

301

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

Not in this case.

100+500=600

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

280+400

85000 + 100000

Rounding both numbers to the nearest ten it is about 80

The answer is 119.5. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.

90. You round both numbers up.

The answer is 919. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.

Notice that each of the three numbers is rather close to 9,000. The estimated sum is 27,000.

Thing of it this way, you are adding negativity, therefore you are taking away positivity, which is what the numbers you are working with are, when doing adding sums.