120+80
94
30+600+630
250 and 750, which sum to 1000. The exact sum is 1001.
You could use 250 and 750.
120+80
94
650 + 290 = 940
30+600+630
250 and 750, which sum to 1000. The exact sum is 1001.
You could use 250 and 750.
In general, numbers are not compatible or otherwise in isolation. They are compatible in the context of other numbers. Two (or more) numbers are compatible if their sum (or other combination) is a number which YOU find easy to work with. As you acquire more experience, you may find that more and more numbers become compatible.
88 is the sum of those two numbers.
17 and 4: sum is 21.
you can use whole numbers
2.0999999999999996
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?