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Mental Arithmetic: work the following exercises in your head. Do not calculate with a pencil or paper. Do not use a decimal. Think of the number seven. Now add eight to it. Now add four more. Now subtract nine. Now add three. Your answer is _____.

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spryor1577
13 is your answer.
7+8=15
15+4=19.
19-9=10
10+3=13
The answer is 13 because it is