Calculation of number of rivets required
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For example, if you counted 24 beats in 15 seconds, multiply 24 by 4 = 96. The song's tempo is 96BPM. You multiply by four, because 60 seconds divided by 15 seconds = 4.
To increase accuracy, count beats for longer periods of time and calculate the rate accordingly. Using the same song as in the previous example, if you counted for 30 seconds instead of, you might have counted 50 beats instead of 48, which means the tempo is just a little faster: 50 x 2 = 100. (Multiply by two because 60 seconds divided by 30 seconds = 2.)
To increase accuracy, count beats for longer periods of time and calculate the rate accordingly. Using the same song as in the previous example, if you counted for 30 seconds instead of, you might have counted 50 beats instead of 48, which means the tempo is just a little faster: 50 x 2 = 100. (Multiply by two because 60 seconds divided by 30 seconds = 2.)
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