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మీ దేశాన్ని గుర్తించలేకపోయాం. NCR ఒక ప్రపంచవ్యాప్త రేటింగ్ వ్యవస్థ — ప్రతిచోటా ఒకేలా పనిచేస్తుంది. మీ జెండా, మీ జాతీయ ర్యాంకు, మీ స్థాయి ఆటగాళ్లను నిర్ణయించడానికి మీ దేశాన్ని ఎంచుకోండి.

మీ దేశాన్ని ఎంచుకోండి →

Chess Lab › The numbers room

బియ్యపు గింజ

  • రెట్టింపు, ఘాతాలు
  • Ages 8 to 14
  • About 7 minutes

The story behind it

An old Indian legend says the inventor of chess asked his king for a reward that sounded tiny: one grain of rice on the first square, two on the second, four on the third, doubling to the end of the board. The king laughed. Then his treasurers did the sum.

Read the full story: The king who could not pay →

How to play

  1. Tap each square in turn to lay the rice.
  2. Every square holds twice the one before.
  3. Use the board to answer Ashta’s questions.

Levels

For teachers and coaches

Grain of rice — Doubling and powers

Ages 8 to 14 · about 7 minutes · 8by8verse Chess Lab

What it teaches

Repeated doubling, powers of two, and how quickly exponential growth leaves ordinary counting behind.

The story to tell first

An old Indian legend says the inventor of chess asked his king for a reward that sounded tiny: one grain of rice on the first square, two on the second, four on the third, doubling to the end of the board. The king laughed. Then his treasurers did the sum.

Three questions to ask

  • The total so far is always one less than the next square. Can you see why?
  • Which is more: a thousand grains a day for a year, or the rice on square 20?
  • Where else does something double again and again?

Without a screen

Fold a sheet of paper in half, then again, and count the layers each time. How many folds before you cannot fold it?

హీట్ మ్యాప్ లెక్కించడం, పోల్చడం మూలలో ఉన్న గుర్రం రెండు గడులకే చేరుతుంది. మధ్యలో ఉంటే — లెక్కపెట్టండి. వయసు 7 నుంచి 12 · సుమారు 6 నిమిషాలు Back to the labAll 19 games and 12 stories.