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Telling Time Practice Calculator

Work out telling time practice instantly with clear inputs, formula shown and shareable results.

About Telling Time Practice Calculator

The start time is converted to minutes since midnight, the elapsed minutes are added, and the total is wrapped back into a 24 hour day before being split into hours and minutes. Working in minutes since midnight removes the base-60 stumbling block, which is why timetable questions become easy once a child adopts it.

Formulas

Minutes since midnight

start = 60 x hour + minute

Finish time

finish = (start + minutes added) mod 1440, then hours = floor(finish / 60), minutes = finish mod 60

Worked example

With the default values below, Telling Time Practice Calculator returns Finish time (24h) of 10:05. Change any input above and every figure here is recalculated in your browser.

Inputs used

Start hour (24h)accepts 0–23
9
Start minuteaccepts 0–59
15
Minutes to add
50

Results

Finish time (24h)
10:05
Finish time (12h)
10:05 am
Minutes since midnight
605
Time added in hours
0.83 h

Step by step

  1. 1Values used
  2. 2Minutes since midnight
  3. 3Finish time
  4. 4Finish time (24h)= 10:05
  5. 5Finish time (12h)= 10:05 am
  6. 6Minutes since midnight= 605
  7. 7Time added in hours= 0.83 h

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Telling Time Practice figure worked out?

start = 60 x hour + minute. The start time is converted to minutes since midnight, the elapsed minutes are added, and the total is wrapped back into a 24 hour day before being split into hours and minutes.

Why does this matter?

Working in minutes since midnight removes the base-60 stumbling block, which is why timetable questions become easy once a child adopts it.

What do I need to enter?

Enter start hour (24h), start minute, minutes to add. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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