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19 May, 13:34

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

14

13

12

11

+4
Answers (2)
  1. 19 May, 16:35
    0
    7 + 8

    15 + 4

    19 - 9

    10 + 3

    13

    I know it said not to work it out on paper but here's how to get the answer.
  2. 19 May, 17:25
    0
    The answer is the second option (13)
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