According to statistics, on June 1st, 213, Jinzhou World Garden Expo * * * received about 154, visitors, and 154, visitors can be expressed by scientific notation.

Analysis of test questions: According to the definition of scientific notation, the expression form of scientific notation is a×1 n, where 1 ≤| A | < 1, and n is an integer, and the key to expression is to correctly determine the value of A and the value of N.. When determining the value of n, see whether the number is greater than or equal to 1 or less than 1. When the number is greater than or equal to 1, n is its integer digits minus 1; When the number is less than 1,-n is the number of zeros before its first significant digit (including one zero before the decimal point). Therefore,

∵154 is one ***6 digits, ∴154=1.54×1 5.