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How many digits of pi do you know?
Type the digits of pi from memory until your first slip, then learn the next twenty digits with a picture for each pair.
The first 100 digits of pi
3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679
The digits match sequence A000796 in the On-Line Encyclopedia of Integer Sequences.
The same 100 digits as pictures
Pi starts 3.14159, and most people stop about there. Read the digits after the decimal point in pairs, give each pair a picture, and they turn into a story: 14 15 92 65 35 is a tire, a towel, a pen, a shell and a mule. The pictures are the peg words of the Major System, the same ones as on the 00 to 99 chart, except that a pair starting with zero gets a two-sound word beginning with S (07 is a sock, not a key), so no zero is ever dropped.
| Places | Digits | Pictures |
|---|---|---|
| 1 to 10 | 1415926535 | tire, towel, pen, shell, mule |
| 11 to 20 | 8979323846 | fob, cap, moon, movie, rash |
| 21 to 30 | 2643383279 | notch, ram, movie, moon, cap |
| 31 to 40 | 5028841971 | lace, knife, fire, tape, cat |
| 41 to 50 | 6939937510 | ship, map, poem, coal, toes |
| 51 to 60 | 5820974944 | leaf, nose, puck, rope, rower |
| 61 to 70 | 5923078164 | lip, name, sock, fat, chair |
| 71 to 80 | 0628620899 | sash, knife, chain, safe, pipe |
| 81 to 90 | 8628034825 | fish, knife, sumo, roof, nail |
| 91 to 100 | 3421170679 | mower, knot, tack, sash, cap |
Ten digits is five pictures, so the first hundred take fifty. How to memorise 100 digits of pi places the pictures along a route and gives a one-week plan, and the pi journey carries on to 3,141 digits with reviews spaced out over weeks.