When the new book Units of Fire was released, Jonathan decided to read it in one sitting for his book report. He started at 11:00 a. m. on Saturday morning and read until 8:00 p. m. that night, for a total of 9 hours. For school, however, he needed to record the exact number he spent reading. What is the Order of Magnitude of the number of seconds he reads?

Question

Mathematics

Mariah Benjamin

31 January, 01:23

When the new book Units of Fire was released, Jonathan decided to read it in one sitting for his book report. He started at 11:00 a. m. on Saturday morning and read until 8:00 p. m. that night, for a total of 9 hours. For school, however, he needed to record the exact number he spent reading. What is the Order of Magnitude of the number of seconds he reads?

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Jan · Answer 1

9 hr * 60 min/hr = 540 min. 540 min * 60 sec/min = 32,400 sec. Use the method described by panic mode: round the number down until there is only one non-zero digit left. Here, 32,400 rounds down to 30,000. Now count the number of zeroes; the result is the order of magnitude: 4. (You see this in scientific notation also: 30,000 = 3 * 10^4.)