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The fifth grade, the second volume of mathematics, ten minutes to control the classroom, 2 1 page math game.
..... our first grade content. ...

The period of 0.4545 is 45 out of 99.

The period of 0.7272 is 72 in 99.

0.55 period: 5 out of 9

0. 123 13 period: 123 13 in 9999.

0.2 12 1 period: 2 1 99.

So: 0. XXX is XXX of 999 (the number of search links is 9).

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