This math document discusses multiplying and dividing decimals by powers of 10. It states that multiplying by 0.1 is the same as dividing by 10, and multiplying by 0.01 is the same as dividing by 100. Examples are provided of multiplying various numbers by 0.1 and 0.01. It also notes that dividing by 0.1 is the same as multiplying by 10. Examples of dividing by 0.1 and multiplying by 1000 are given.