Answer:

1.)1.805

2.)1.398

3.)1.801

4.)8.336

5.)20.403

Step-by-step explanation:

i plus mo..

1. 1.805 2. 1.398 3. 1.801 4.8.326 5.20.402 step by step explanation: note: you must add decimal numbers in column , and copy the number of decimal places from the last number to decimal decimal point . if they didnt have the same number of decimal number after the decimal place you must copy the number of decimal places that the greter value. (1.042+0.763) the have the same number of the decimal place after the decimal point which is three so i add it and place the decimal point three moves from the least value of decimal places the answer is 1.805. (1.031+0.77) they didnt have the same number of decimal places after the decimal point so you must copy the number of decimal places that has a bigger value,the answer is 1.801