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Math in the third grade of primary school, using small squares as calendar problems? What are the characteristics of numbers representing years and months?
Year 2 because it is a cube with six faces, one writes 20, the other writes the last two features, and the first two features are 20.
You can't use one month and two April because of his 7-digit characteristics?
On the thirtieth day, two are also seven, a new cube, the remaining one and the previous one.