How to calculate the ratio and simplify the simplest ratio for integer ratio, fractional ratio and decimal ratio

For example, 3:6 = 3 / 6 = 1 / 2 fractional ratio, use the former term to divide the latter term. For example, 4 / 5:9 / 5 = 4 / 5 △ 9 / 5 = 4 / 5 × 5 / 9 = 4 / 9 decimal ratio: convert to integral ratio, and then calculate according to the method of integral ratio. For example, 1.6:0.06 = 160:6 = 160 / 6 = 80 / 3, as for the ratio and the simplest ratio are similar, as long as it is written in fractional form, that is

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