25 in Coptic epact
× 20× 5
Twenty followed by five; an explicit proposal example.
HISTORICAL · DECIMAL SIGN-VALUES
Coptic epact
Cursive number signs from Coptic-Arabic manuscripts.
Convert numbers- Place
- Egypt
- Period / variant
- Tenth century onward
EXAMPLES
205 · Decimal sign-values
Two hundred followed by five; an explicit proposal example.
Worked example
Write 205 in Coptic epact
Write the larger values first, from left to right. Each sign carries its own value; add the groups.
- × 200
Write this sign for 200. Its value is 200 by itself.
- × 5
Write this sign for 5. Its value is 5 by itself.
Check
200 + 5 = 205
Sources and notation notes
Meet the symbols
Each tile shows a sign and what it means. A sign can stand for a whole amount, such as 10 or 100.
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 20
- 30
- 40
- 50
- 60
- 70
- 80
- 90
- 100
- 200
- 300
- 400
- 500
- 600
- 700
- 800
- 900
How the symbols fit together
Each sign names a whole amount, such as five, twenty, or two hundred. Add the signs to get the number.
- There are separate signs for 1–9, 10–90, and 100–900. A two-hundred sign already means 200.
- For 205, read the two-hundred sign first: it contributes 200.
- Read the five sign next: it contributes 5. Add 200 + 5 = 205.
- There are no tens to add, so no tens sign is written. No zero placeholder is needed. Read the signs from left to right, largest first.
205 in Coptic epact
× 200× 5
Two hundred followed by five; an explicit proposal example.
250 in Coptic epact
× 200× 50
Two hundred followed by fifty; an explicit proposal example.
The converter covers 1–999. Larger quantities use a sublinear thousands mark, and manuscripts can add a wavy number mark above the sequence. Those extensions and historical fraction forms are not implemented here.
History
Epact numerals developed in the Coptic-Arabic community and appear in astronomical and administrative manuscripts. Their forms derive from cursive Coptic letters, but constitute a distinct number repertoire rather than the ordinary Coptic alphabetic numeral convention.
How to read it
Each sign names a whole amount, such as five, twenty, or two hundred. Add the signs to get the number.
- There are separate signs for 1–9, 10–90, and 100–900. A two-hundred sign already means 200.
- For 205, read the two-hundred sign first: it contributes 200.
- Read the five sign next: it contributes 5. Add 200 + 5 = 205.
- There are no tens to add, so no tens sign is written. No zero placeholder is needed. Read the signs from left to right, largest first.
Limits
The converter covers 1–999. Larger quantities use a sublinear thousands mark, and manuscripts can add a wavy number mark above the sequence. Those extensions and historical fraction forms are not implemented here.
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