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Exercise 15. Translate into English.

1. In 1980, Shakuntala Devi from India entered the Guinness Book of Records for correctly multiplying two 13-digit numbers in 28 seconds.

2. Samarth Patel from India set a record when he solved 10 multiplication tasks faster in 1 minute. At the time of the record, he was only 7 years old.

3. Main divisibility rules:

   • A number is divisible by two when its last digit is even;
   • A number is divisible by nine or by three when the sum of its digits is divisible by these numbers;
   • A number is divisible by five when its last digit is five or zero.

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