No, but three over eight is.
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1.1429
Oh, isn't that a lovely number, 7.885? It sure is a rational number because it can be expressed as a fraction where the numerator and denominator are both integers. Just like painting a happy little tree, rational numbers can be expressed neatly and precisely.
68 /\ 2 34 /\ 2 17
In rational form, 3.75 can be expressed as (\frac{15}{4}). This is because 3.75 is equivalent to 3 (\frac{3}{4}) when written as a mixed number. Converting the mixed number to an improper fraction gives (\frac{15}{4}), which is the rational form of 3.75.
Well, isn't that a happy little question! No, 2.236068 is not a rational number. It is actually an irrational number because it cannot be expressed as a simple fraction of two integers. Just like every tree and cloud in nature, numbers come in all different shapes and sizes, and that's what makes them so special.
A number tree is a tree with numbers on it
Mangrove
Quite a number of baobabs in Africa have been dated to over 1,000 years
The prime factorization of the number at the top
If you are looking at willow tree nativity, you have a fair number of options. I would suggest that you start your investigation over at willowtree.info/products/nativity
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2