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Explain the divisibility rule of 7.
Divisibility rule for 7:
• First double the last digit of the number.
• Then subtract it from the remaining number.
• If the result is divisible by 7, then the original number will also be divisible by 7. For example: Let’s check if 623 is divisible by 7 or not.
• First double the last digit of the number (3 x 2 = 6).
• Then subtract it from the remaining number (62 – 6 = 56).
• We know that 56 is divisible by 7ie, $\frac{56}{7} \ =8$, then the original number (623) will also be divisible by 7 ie, $\frac{623}{7} \ =89$.
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