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Drag the numbers on top of each other to add. Use the fist to break up the numbers
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More about the number 45 The sum of 1+2+3+4+5+6+7+8+9 = 45
Also
Multiply 123456789 by 2 and you get 246913578 , the sum of which is 45
Divide 123456789 by 2 and you get 61728394.5, the sum of which is 45