90-80 is 10.
To estimate 46.78 - 18.55, you can round both numbers to the nearest whole number. Rounding 46.78 gives you 47, and rounding 18.55 gives you 19. Then, subtract the rounded values: 47 - 19 equals 28. This provides a quick estimate of the difference.
yes
find GCF(Greatest Common Factor) then subtract
To estimate the difference, you find the difference first. To find the difference, you subtract the numbers you are given. Then you estimate your final answer (the difference).
Subtract the atomic number from the atomic mass after rounding each.
Subtraction by rounding is making the terms simpler to subtract. Turn 18.9 into 19. 0.1 was added, so later 0.1 needs to be subtracted. Now it is 34.4-19. 34.4-19=15.4. Now subtract the 0.1. 15.4-0.1=15.3 The answer is 15.3.
Range.
In arithmetic, estimate usually means rounding the numbers so they're easier to manipulate. Example: Estimate the sum of 432 and 267. You can round them to 430 and 270 and estimate the sum as 700. You could also round them to 400 and 300 and estimate the same total. To estimate a difference, just subtract them. 430 minus 270 is 160. The actual sum is 699 and the actual difference is 165, so your estimates came pretty close.
Subtract the greatest range by the least and you have your answer.
explain how you would estimate to subtrac 189 from 643
You take the greatest number and the lowest number and subtract both
3.612