Put them one below the other so that the decimal points are aligned. Fill out to the right with extra zeroes, so that they have the same amount of decimals - or just imagine the missing zeroes.
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Same rules as adding whole numbers with different signs.
They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.
1. When adding, the decimals MUST line up: 012.3 +32.1 2. When multiplying, you dont have to put the decimals side by side: 12.3 x323.55 Then you count how many numbers are after the decimals, which, in this case, is three. Hope it helped!
keep your decimals in the right position
To add the two decimals together