Decimal multiplication

1, first calculate the product by integer multiplication, and then point the decimal point. (Ignore the decimal point first, 13 times 5 to get 65)

2、

When calculating the decimal point, the decimal point is calculated from the right of the product according to how many decimal points there are in a factor.

(1.3 and 0.5 each have a decimal point, so the final answer is 0.65).