20+5 500+1 200+61
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Expanded Notation of 25 = (2 x 101) + (5 x 100).
2.5 * 101, or just 2.5 * 10
25 = (2 x 101) + (5 x 100) or (2 x 10) + (5 x 1)
25 = (2 x 10) + (5 x 1)
5 to the second power = 25 25 times -10 = -250-250 + -11 = -261-261*8 = -2088