Adding Time on a Calculator - Time Clocks, Time Clock ...
[Pages:1]Adding Time on a Calculator
Adding time on a calculator without converting the minutes to hundredths is inaccurate.
Units of time are calculated as 60 minutes equals 1 hour, but a calculator uses units of 100.
For example, if an employee worked 9 hours and 30 minutes on one day and 8 hours and 45 minutes on the day, the time card would display 9:30 for day 1 and 8:45 for day 2. If you were to add these without converting on a calculator, you would get 17.75 hours which is 17 hours and 45 minutes.
9.30 8.45 17.75 = 17 hours and 45 minutes. This is inaccurate.
When you change the minutes to 100ths using the conversion chart below, the 9:30 becomes 9.50 and the 8:45 becomes 8.75. If you add these two numbers on the calculator you get 18.25, which is 18 hours and 15 minutes.
9.50 8.75 18.25 = 18 hours and 15 minutes. This is correct.
A Time Conversion Chart is provided here to help with the converting of the time from minutes to 100ths prior to adding it on a calculator.
Min. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
100ths 0.02 0.03 0.05 0.07 0.08 0.10 0.12 0.13 0.15 0.17 0.18 0.20 0.22 0.23 0.25 0.27 0.28 0.30 0.32 0.33
Min. 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
100ths 0.35 0.37 0.38 0.40 0.42 0.43 0.45 0.47 0.48 0.50 0.52 0.53 0.55 0.57 0.58 0.60 0.62 0.63 0.65 0.67
Min. 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
100ths 0.68 0.70 0.72 0.73 0.75 0.77 0.78 0.80 0.82 0.83 0.85 0.87 0.88 0.90 0.92 0.93 0.95 0.97 0.98 1.00
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