Volume and Density 0% COMPLETE Volume - 10 min Density - 6 min Density Math - 12 min IndeX Home Lesson 1 of 3 Volume - 10 min Learning Objective(s): Use the same unit magnitudes when applying mathematical operations to measured numbers. Determine the volume of an object by length calculation or by immersion in water. Reminder on Measuring Be careful with units this whole semester. When you add/subtract or multiply/divide measured values, you need to make sure that all the units of those measurements are the same. You know that if someone says, 'I ran a mile.' and someone else says, 'I ran 10 meters.' The first person obviously ran much farther than the second person even though 10>1. (A meter is about the distance from the floor to a doorknob.) Imagine that you lined up four 12-inch rulers to measure a long board and the last ruler was a little longer than the remaining portion of the board. It showed the final board was 8 in long. Which answer makes the most sense when calculating total length of the board? 1 ft + 1 ft + 1 ft+ 8 ft = 11 ft long 1 in + 1 in + 1 in + 8 in = 11 in long 12 in + 12 in + 12 in + 8 in = 44 in long 12 ft + 12 ft + 12 ft + 8 ft = 44 ft long