The abacus in the figure has "five" playing the role of "ten." (a) What number is represented on this five-bead abacus? (b) How would this number naturally be recorded?

A. (a) 625, (b) 10,000
B. (a) 20, (b) 40
C. (a) 125, (b) 1000
D. (a) 25, (b) 100


Answer: C

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