How to calculate the number of vertical digits of decimal multiplication (please list the vertical digits) the following questions, please give an example: 1.3 * 3.4 (and accurate to 10 digits) It's a 1.3 * 3.4 product, accurate to the tenth

1.3 1.3 multiplied by 3.4 is about 4.4, so I don't need to list the formula. You can do all the symbols
three point four
——
four point four two

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