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Addition and Subtraction of Hours and Minutes

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Perform addition and subtraction of hours and minutes.
　
( Hours
minutes) ×
Times
　
( Hours
minutes) ×
Times
　
( Hours
minutes) ×
Times
　
( Hours
minutes) ×
Times
　
( Hours
minutes) ×
Times
Total Time Hours Minutes
　=  Hours
　=  Minutes
An entry is excluded from addition or subtraction if both its hours and minutes are 0, or if its repetition count is 0.
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