90
425
compatible numbers is just like to round or estimate a number. Ex: 44 the compatible number is to 40. because if the number less than five is rounded to the nearest ten (down). Ex: 56 the compatible number is 60. why? because a number greater than 5 is rounded up.
Estimate each difference means to estimate the numbers that they give you estimate means round to the nearest 10 like if 24 and you have to round it it will be 20 if the number is 25 which is in the middle than it will be the number upper which is 30
If you know the number is 7128 I do not understand why on earth anyone would want to estimate it!
90
5
425
590
Yes
compatible numbers is just like to round or estimate a number. Ex: 44 the compatible number is to 40. because if the number less than five is rounded to the nearest ten (down). Ex: 56 the compatible number is 60. why? because a number greater than 5 is rounded up.
300+60=360
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210 + 350 = 560
Because you will see that the sum or difference is close to your estimate. If it isn't that close, round the number you're estimating to the nearest compatible number and find the sum or difference Sum = Addition Difference = Subtraction Product = Multiplication Quotient = Division Does this answer help?
rounding numbers is to nearest ten or hundred and compatible numbers are when you can do nearest 5
11