The answer is 54. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
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8 + 1 = 9 5 + 4 = 9 9 + 9 = 18 ( 8 + 1 + 5 + 4 = 18) The answer is 18.
4/9 x 2/2 = 8/18 5/18 + 8/18 = 13/18
18 + 2 / 4 = 18 + .5 = 18.5
18
5 + -13 + 18 = 5 - 13 + 18 = 10