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Numbers · Telling Time

Day and Night

Walk Rahul’s day, meet the round clock that shows every number twice, and work out where AM and PM come from.

AM, PM & the 24-hour clock Class 2
07
AM
3
PM
Class 2 · Telling the time

Day and Night

Follow Rahul through one Monday. Find out why the clock says three o'clock twice — and what AM and PM are for.

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Day and Night

About this game

A step-by-step introduction to AM and PM for children who can already read whole hours, built for the Indian school curriculum (CBSE, ICSE, and state boards).

Why AM and PM are hard

A round clock shows every number twice a day. The hand sits on 3 while Rahul is fast asleep, and again while he is eating his snack. Until a child sees that repeat, AM and PM are two words to memorise rather than two halves of a day.

How this game teaches it

The names are never handed over first. The child walks Rahul’s whole day on a 24-hour clock, where nothing repeats. Then the round clock arrives and the numbers come round a second time — and only after the child finds that repeat are the halves named. The arithmetic comes last.

How to play

  • Start at Rung 1 and walk Rahul’s day, hour by hour.
  • Tap the answer you think is right. A wrong tap gets you another look — never a buzzer, never a cross.
  • Some rungs hand you the clock to step yourself: press earlier and later, and watch what changes.
  • Clear a rung to earn a cog and open the next one.
  • Stuck? Show me walks you to the answer instead of telling you.
  • Nothing counts down. No timers, no lives, no score shaming.

What kids learn

Phase A · The unambiguous day

  • Read the 24-hour clock, 00:00 to 23:00.
  • Cut the day in two at 12:00 noon — never at lunch.
  • Tell after noon from afternoon.

Phase B · The round clock and the discovery

  • Find that the hand passes each number twice a day — first trip, second trip — before AM and PM arrive.
  • Judge a cue, and know when one is not enough.
  • Handle the twelves: 12 AM is 00:00, 12 PM is 12:00.

Phase C · The arithmetic

  • Take twelve away above twelve; add twelve for PM, nothing for AM.
  • Carry the minutes across unchanged.

What’s inside

  • 24 rungs, three phases — the unambiguous day, the round clock and the discovery, then the arithmetic.
  • Rahul’s Monday — fourteen painted scenes, fast asleep to bedtime.
  • The twin pairs — 3 asleep against 3 snack, 8 breakfast against 8 dinner, 9 school against 9 bed.
  • An inner ring the child builds by walking the second lap.
  • The sky cue — where the sun sits, walked from midnight so its direction is readable.
  • “This is not enough to tell” — a real answer, because one cue is sometimes not enough.

Free & private

MathGuru is built by a parent in India, with these promises:

  • Play right now. Open the link and your child plays — no sign-up.
  • No ads. Ever. No banner, no popup, no third-party tracker.
  • Works on any device. Mobile, tablet, laptop, low-end Android.
  • Free foundation, always. The foundation games stay free.
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Monday, midnight to midnight

Watch the whole day go by.

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Digital
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12 1 2 3 4 5 6 7 8 9 10 11
24 13 14 15 16 17 18 19 20 21 22 23
No clocks this time

Look at the number first. Over twelve, take twelve away. Twelve or under, take nothing away — the hand already shows it.

24 hr
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Now the other way round

Going from the round clock to the 24-hour clock, you add twelve — but only if it is PM. An AM time adds nothing at all.

Except the twelves: 12 o’clock AM → 00:00, 12 o’clock PM → 12:00.

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24 hr
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What you have been looking at

Once the digital clock goes past 12, the round clock is always twelve behind it. Step it yourself and watch the gap hold.

Same gap every time. That is the second trip — twelve hours further on than the first.

24 hr
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take 12 away
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12 1 2 3 4 5 6 7 8 9 10 11
PM
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The two halves get their names

You cut Rahul’s day in two at 12:00, and you have just watched the letters change under your own hand. Here is what they are called. Nobody measured them — people simply agreed.

AM
00:00 – 11:00

The half before noon.

PM
12:00 – 23:00

The half after noon.

On a 24-hour clock you can always see which half you are in. On a round clock you cannot — and that is the mystery waiting in the next phase.
The narrator

You already knew these two names. Here is the last piece: the hand’s first trip is the same thing as before noon — AM. Its second trip is after noon — PM. Three ways of saying one thing.

And now the round clock can be read out loud: 15:00 is the second trip, so it is said 3 o’clock PM.

First trip · before noon
03:00
3 o’clock AM
Second trip · after noon
15:00
3 o’clock PM
The last twin pair

Noon and Midnight

Both are called twelve. Six of them in a row, and the near-misses are mixed in. There is no clock on you and nothing to lose — take as long as you like.

12
12:00 · lunch
vs
12
00:00 · fast asleep
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24 hr
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{{ pairSideWord }} noon
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24 HRRAHUL
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{{ bcSideWord }} noon
−1 HOUR+1 HOUR
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Rahul standing on the horizon with his arms straight out, pointing east and west
← EASTWEST →
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24 hr
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12-hour
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24 13 14 15 16 17 18 19 20 21 22 23
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12:00 · NOON

Rahul’s lunch sits beside the marker — it is what makes the moment memorable. The 12:00 marker is what makes the line true.
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