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Подільність чисел

QuestionAnswer
На яке число діляться всі парні числа? На 2
Яке число називається парним? Те, що закінчується на 0, 2, 4, 6 або 8
Яка ознака подільності на 2? Число ділиться на 2, якщо його остання цифра парна
Яка ознака подільності на 3? Якщо сума цифр числа ділиться на 3
Яка ознака подільності на 5? Якщо остання цифра — 0 або 5
Яка ознака подільності на 9? Якщо сума цифр числа ділиться на 9
Чи ділиться число 125 на 5? Так, бо закінчується на 5
Чи ділиться число 138 на 9? Ні, бо 1 + 3 + 8 = 12, а 12 не ділиться на 9
Чи ділиться число 420 на 2 і 5? Так, бо воно парне й закінчується на 0
Якщо число ділиться на 9, то воно обов’язково ділиться на яке ще число? На 3
Число 57 ділиться на 2? Ні, бо воно непарне
Число 57 ділиться на 3? Так, бо 5 + 7 = 12, а 12 ділиться на 3
Created by: user-1992046
 

 



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