0 200 600 Number * Suppose 68% of the students attending the field trip were boys. How can you use the double number line diagram to find the number of boys and to check whether your answer is reasonable? Percent 0 100% 68% of 600 is about 408 boys Convince Me! In finding the percent of a number, when might you want to use the fraction form of the percent instead of the decimal form? 36% of 575 is about of 600.​