Nerdle #1409 Answer
Friday, November 28, 2025
7−11+5=1
- Structure
- A-BC+D=E
- Type
- Mixed Subtraction and Addition
- Result
- 1
How the clues would have read
- Today's equation begins with a single-digit number.
- This puzzle uses addition and subtraction operations.
- The result is a single-digit odd number.
The numbers behind it
- Divisibility: 7 is prime, 11 is prime, 5 is prime, and 1 is prime
- Digital roots: 7 → 7, 11 → 1+1 = 2, 5 → 5, 1 → 1
- Prime factorization: 7 = 7, 11 = 11, 5 = 5, 1 has no prime factors
Why the structure matters
This puzzle's shape is A-BC+D=E — a mixed subtraction and addition, where each letter stands for one digit. Recognising the shape before the arithmetic is what separates a three-guess solve from a six-guess struggle: once you know the equation is a mixed subtraction and addition, most of the search space is gone before you have spent a single guess.
The result, 1, factors as 1 — those factors are exactly the operations that could have produced it.
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