Cheat sheets
How numbers work,
How numbers work,
language by language.
Short, scannable explainers — what's regular, what's irregular, and where the regional splits land. Use them next to the app or on their own.
⌘K
Romance
5 sheetsPortuguês
Portugal · PT-PT
763
setecentos sessenta e três
gender · dois/duas
mil milhões ≠ bilião
Português
Brazil · PT-BR
219
duzentos e dezenove
dezesseis · dezenove
bilhão = 10⁹
Español
Spanish
1.222
mil doscientos veintidós
y only after 30
cien ≠ ciento
billón = 10¹²
Français
French
99
quatre-vingt-dix-neuf
70/80/90 math
septante · nonante (BE/CH)
disappearing s
Italiano
Italian
1.643
milleseicentoquarantatré
no spaces
vowel elision
mille → mila
Germanic
3 sheetsEnglish
English
1,000,000,000
one billion (short-scale)
billion = 10⁹
forty, not fourty
UK "and" vs US
Deutsch
German
87
siebenundachtzig
reversed pairs
one big word
Billion = 10¹²
Nederlands
Dutch
22
tweeëntwintig
reversed pairs
diaeresis ë
één ≠ een
Slavic
1 sheetIndo-Iranian
2 sheetsहिन्दी
Hindi
1,00,000
एक लाख · ek lākh
lakh & crore
1-99 irregular
comma 1,00,000
فارسی
Persian
165
صد و شصت و پنج · sad-o-shast-o-panj
و everywhere
written va, said o
milyârd = 10⁹
CJK
3 sheets日本語
Japanese
42
四十二 · よんじゅうに
counters
native vs Sino
한국어
Korean
25
스물다섯 · 이십오
two systems
만 = 10⁴
counter shortenings
中文
Mandarin
43,256
四万三千二百五十六
万 grouping (10⁴)
两 ≠ 二
tones: 14 ≠ 40