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Course: Arithmetic>Unit 12

Lesson 2: Adding decimals (tenths and hundredths)

Adding decimals with ones, tenths and hundredths

Learn all about adding decimals, specifically in the hundredths place. Learn about aligning decimal points and adding each place value separately, from hundredths to ones. It also introduces a systematic way to add decimals.

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• how do you do the addition of decimals more simple?
• Adding up decimals is as easy as adding up whole numbers. If you line up the place values correctly, the addition is the same. Whenever you set up a decimal addition problem, just double-check that the tenths place of the first number lines up with the tenths place of the second number and so on.
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• uhm what do you mean..?
• is 10 tenths 1 whole?
• Yes, 10 tenths is 1 whole. This is because 10 tenths = 10/10 and 10/10 = 1/1 which is 1 whole.
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• what do we do for the thousandths
• When adding and subtracting decimals just line up the decimals.
• how do you add 4079.59666 and 56464644.4982
• basically you just add and you would get 56468724.0949
• does it work like this? 0.1 + 0.9 + 0.100 + 0.900 + 0.1000 + 0.9000
• kinda, yah. that's 3.