What does subtracting your age from 220 and then multiplying that number by 0.9 calculate?
Target Heart Rate
220 degrees Celsius is 428 degrees Fahrenheit! So if you know temperatures in Fahrenheit, then you should know how hot that is. Just to make your life easier: If you would like to convert: Celsius to Fahrenheit, convert by: 1. Multiplying by 9 2. Dividing by 5 3. Adding 32 Fahrenheit to Celsius, convert by: 1. Subtracting 32 2. Multiplying by 5 3. Dividing by 9
Subtract your age from 220. For example, a 40-year-old woman has a maximum heart rate of 220 - 40 = 180 beats per minute. Multiply your maximum heart rate by 0.6 to get your lower-limit exercise heart rate. Calculate your upper-limit exercise heart rate by multiplying your maximum heart rate by 0.9. The lower-limit number and the upper-limit number are the range your heart should be in while you exercise.
To calculate a target heart rate for exercise, first determine the maximum heart rate by subtracting the person's age from 220. For instance, a twenty year olds maximum heart rate is 220 minus 20, or 200. The target heart rate for moderate intensity exercise is 50-70% of the maximum. This is calculated by multiplying 200 by 0.50 and by 0.70. This gives you a target heart rate range of 100-140.
To find 150 percent of a number, multiply the number by 1.5. In this instance, 1.5 x 220 = 330. Therefore, 150 percent of 220 is equal to 330. Or another way of solving these types of percentages, called whole plus percentages, is simple. 100% of any number is the number itself (100% of 220 is 220) and 50% of any number is exactly half of the said number (50% of 220 is 110) and…