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Divisibility by 7

Most Grade 3 or Grade 4 learners are taught a method of determining a number’s divisibility by 7. In 2019, a 12-year-old Nigerian boy Chika Ofili, became an internet sensation when he received a special award from his school because…

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Division by 9

“Most of us want to avoid 9 in almost all calculations. But again, we can make calculations easier by thinking of 9 as the difference of 10 and 1, (10 – 1). This fact is particularly useful in division by…

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