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Q: Add a sign 5 2 1 0 equals 520?

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because when you add 1 to 0 it is 2

2*-2= -4 2-2= 0

0

1 plus negative 1 equals 0. If you add a negative to something, it is bassically taking it away from the adding number. In other words, you can just change the + sign to a - sign. :)

520

520 can go into 7 0 times.

five five five five equals twenty

520 = (5 x 100) + (2 x 10) + (0 x 1)

The factor pairs of 54 add up to 15, 21, 29 and 55. None of them equal 0.

it is 121

50 mm. (To find out, you just add a 0.)

0.0404

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