超级大脑之多位数相除

This app trains division estimation, multiplication-based checking, and focus. Each issue shows a dividend and a divisor. The player calculates the positive integer quotient and enters the complete answer. The generated issue set has three tiers: easy uses a 2-digit dividend divided by a 1-digit divisor, medium uses a 3-digit dividend divided by a 1-digit divisor, and hard uses a 4-digit dividend divided by a 2-digit divisor. The generator fixes the dividend and divisor digit ranges, then samples a positive integer quotient from the valid range, so every issue divides evenly and the answer is always a positive integer. Short intro: read the dividend and divisor, estimate the positive quotient, and verify by multiplication.