Nerdle #1400 Answer
Wednesday, November 19, 2025
79−43=36
- Structure
- AB-CD=EF
- Type
- Double-Digit Subtraction
- Result
- 36
How the clues would have read
- Today's equation begins with a two-digit number in the 70s.
- This puzzle uses subtraction only.
- The result is a 2-digit even number.
The numbers behind it
- Divisibility: 79 is prime, 43 is prime, and 36 is divisible by 2, 3, 4, 6, 9, 12, and 18
- Digital roots: 79 → 7+9 = 16 → 7, 43 → 4+3 = 7, 36 → 3+6 = 9
- Prime factorization: 79 = 79, 43 = 43, 36 = 2²×3²
Why the structure matters
This puzzle's shape is AB-CD=EF — a double-digit subtraction, 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 double-digit subtraction, most of the search space is gone before you have spent a single guess.
The result, 36, factors as 2²×3² — those factors are exactly the operations that could have produced it.
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