Students know that when multiplying a decimal by a number ending in zeros, the decimal point is first ignored and then placed in the product as many places from the right as the number of decimal digits in the original number. They practice this idea thoroughly in multiply hundredths less than 0.1 And multiples of 100 worksheet. In each problem, the numbers are laid out in the vertical format. In this format, pair of digits in each successive place are tackled one by one. This helps students follow a structured approach.