11111-1

Поскольку задача написана как 11111-1, это числовое вычитание. Ниже простой пошаговый разбор на английском, подходящий для 4 класса.

Step-by-step solution (in English for Grade 4)

• Step 1: Read the problem. You need to subtract 1 from 11111.
• Step 2: Look at the ones place (the last digit). 1 minus 1 equals 0.
• Step 3: Write down 0 in the ones place. The other digits stay the same: 1111... (the first four digits are still 1).
• Step 4: Put it together. The result is 11110.
• Step 5: Check your work (quick check). 11110 + 1 = 11111, which matches the original number.
• Step 6: Answer in different formats:
  • Digits: 11110
  • With thousands separator (optional): 11,110
  • In words: eleven thousand one hundred ten

Brief notes for understanding

• Why no borrowing needed: we subtracted 1 from the last 1, which becomes 0, and the other digits don’t change.
• You can verify by adding back: 11110 + 1 = 11111.

If you want more practice, I can give you a few similar problems (e.g., 22222 - 1, 10101 - 1) with step-by-step solutions. Also, tell me if you’d like explanations in Russian as well.