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To Multiply Two-digit Numbers by 11
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Letter from the Editor: October 16, 2026
Kaju Katli
Wall of Fame
News Bulletin

India delivered a stellar performance at the 19th International Olympiad on Astronomy and Astrophysics (IOAA) in Hanoi, Vietnam, with four team members bagging gold medals and one bagging a silver. With 307 students from 64 countries, this year’s edition was the biggest IOAA yet, demonstrating the remarkable achievement of the Indian students.


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To multiply a two-digit number by 11, add the digits in the number’s tens and units place. Once you get
When multiplying a single-digit even number by 6, the number in the unit’s place of the product will be the
To simplify the addition of big numbers, expand the numbers based on their place values. Then, add the values of
To divide numbers ending in zero by numbers ending in zero, remove the same number of zeroes at the end
To multiply numbers ending in zero, first, exclude the zeros from the numbers. Then, multiply the numbers without the zeros.
To double a large number easily, break the number down with each digit representing its place value. Then, multiply each

















