Well, isn't that just a happy little number! To write eighteen and nine tenths, you simply put down the number 18 followed by a decimal point and then the number 9. So, it looks like 18.9. Just like that, you've created a beautiful representation of a number on your canvas!
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The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7
eighteen and four tenths.
0.9 that is how you write nine-tenths in standard form
9.9
Fourteen and nine tenths (14.9) in standard form = 1.49 × 101