First, we want to find the first multiple of 7 above 100. This is 105. 105/7=15.
Next, we want to find the last multiple of 7 below 500. That would be 497/7=71.
Now, we perform 71-15=56. Since our list was inclusive, meaning that we counted both 105 and 497, we add one to get 57 multiples of 7 between 100 and 500.
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100, 200, 300, 400, 500, 600, 700, 800, 900, 1000
7 x 29 = 203, 7 x 71 = 497. There are therefore 71 - 28 ie 43 multiples of 7 in the range.
The 3 digit numbers under 500 are 100 through 499.
Between 100 annnd 500 dollars.
Accuracy % = ((keystrokes - errors) / keystrokes) * 100 Example: 500 keystrokes - 25 errors = 475 accurate keystrokes 95% = ((500 - 25) / 500) * 100 = (475 / 500) * 100) = .95 * 100 Check: 500 keystrokes - 25 errors = 475 accurate keystrokes 500 keystrokes * 95% accuracy = 500 * .95 = 475 accurate keystrokes 475=475=true! --------------------------- Original Poster's Method: --------------------------- number of mistakes divided by the number of keystrokes multiply by 100 subtract from 100