Divisibility Rule for 7 | Mental Math Fluency

Checking for divisibility by 7 is no longer a hard nut to crack with this handy divisibility rule. No matter how large the number is, remove the last digit, double it, subtract it from the truncated number, repeat the process until there’s just one digit is left. If that digit is divisible by 7, then the number is divisible by 7. That’s a long story cut short!
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