Assuming you meant 85.4 + 0.97 + 1.30, the correct number of decimal places should be 1, that is, only one digit after the decimal point. When determining the number of significant digits for purposes of addition, you round it off to the least precise of the numbers - the one with the fewest digits to the right of the decimal point. If you are asking how many total digits the answer should have - the answer would be 3 - (the sum would be written 87.7).
2
accounting
"You have to count the spaces to the right to know how many spaces you have to put."
You should put the numbers with the same number of decimal places to compare. 0.050 > 0.015 So the answer is yes.
The answer to an addition question should have no more decimal places than the smallest number of decimal places in the numbers being added. When rounding numbers, numbers 5 though 9 will be rounded up and 1 through 4 will be rounded down.
When adding decimal numbers, the decimal points should be lined-up.
The number of decimal places in the product must equal the total number of decimal places in the factors. John's product should have 2 decimal places.
4
The number of decimal places has no bearing on the relative value. 0.2 is greater than 0.137 0.402 is greater than 0.3
If the two numbers have x and y decimal places respectively, then the raw product (before deleting and trailing 0s) has (x + y) digits after the decimal point.
2
A number in scientific notation should have one number before the decimal place then two after. You move the decimal so this is true, then the number of places you moved the decimal will be the exponent. If you move the decimal to the right your exponent will be negative, if you move it to the left it will be positive. In this case you would move the decimal 5 places so you have 1.05x10^-5.
You should round to two decimal places unless the number is large - like the US national debt, for example.
= significant figures = and got For addition and subtraction, the result should have as many decimal places as the measured number with the smallest number of decimal places.
The digits should stay where they are. The decimal point should move 2 places to the left.
accounting
The statement is false.