A reasonable estimate of the sum of 78 and 119 is 197.
A reasonable estimate is 1000. The actual total is 1016.
1 + 3 + 5 + ... + 857 + 859 = 184900
The sum is 2.05 and you don;t need to estimate such a simple sum!
46.78-18.55 and estimate each sum or difference = 28.23
7.5 + 9.2 = 16.7So 16.7 is reasonable.===========================You should not have to perform the addition in order to decide whether an estimatewas reasonable. That defeats the whole purpose of the estimating process.Ignore the decimal parts of your two numbers, and you have (7 + 9). You don't needa calculator to know immediately that THAT sum is 16. So 16 is a good estimate forwhat you'll have when you glue the decimal bits back onto the whole numbers, andwhen you reassemble everything and get a sum of 16.7 , that's so near your estimatethat you can be pretty sure that you added correctly.
. 87.8. 17.3------------.105.1As can be seen by the above sum, 105.1 is reasonable.
It depends on your level of numerical skill. You can convert the decimal to an approximate fraction and estimate the sum of the two fractions, or you can convert the fraction to an approximate decimal and estimate the sum of the two decimals or, if you are more able you just estimate their sum directly.
One estimate is 800 although there is really no need t estimate such a simple sum: it is 778.
It is 61: you do not need to estimate a sum as simple as that!
17 and 4: sum is 21.
The sum of a single number is itself. So the answer is 12904 - and no estimate required.
To estimate the sum is to guess what the answer is for an addition problem. For example, if it was 8 + 9 you would see what number 8 is close to (like ten) and do the same with number nine and your estimate would be 20.
Because 7.5+9.2 = 16.7
Why do you need to ESTIMATE? The exact answer is easy enough to determine! It is 94.