Question

Check the divisibility conditions for 5 and 7 of the following numbers. i) 555555 ii) 66666 iii) 8888 iv) 434 ​

Answer 1

Answer:

i) 555555 is divisible by 5 not by 7

ii) 66666 is not divisible by 5 and 7

Step-by-step explanation:

$The \: last \: digit \: is \: 0 \: or \: 5$

$Double \: the \: last \: digit \: and \: subtract \: it from \: a \: number \: made \: by \: the \: other \: digits \: . The \: result \: must \: be  \: divisible \: by \: 7 \: . (We \: can \: apply \: this \: rule \: to \: that \: answer \: again)$

last digit must be 5 or 0 for divisible to 5