Cross multiplication : বজ্রগুণন;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Contribution to (অবদান): His invention made a major contribution to road safety.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Far and wide (সর্বত্র): His fame spread far and wide.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.