It is an error. 11 cannot be 0.5 in decimal form.
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.45454545....... and so on!
11 over 16 in decimal form = 0.6875 11/16: = 11 ÷ 16 = 0.6875 in decimal
nine and five elevenths = 9.4545
5
5 and 1/5 is 5.2 in decimal form.