Simplify $15\times 3$ in $mod 8$

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Odinaka_OTyro

Asked: January 7, 20212021-01-07T16:23:01+00:00 2021-01-07T16:23:01+00:00In: Arithmetic, Numbers and Combinatorics

Simplify $15\times 3$ in $mod 8$

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Simplify $15\times 3$ in $mod 8$

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Sengemegz · Accepted Answer · 2021-01-08T19:36:30+00:00

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Sengemegz Moderator

2021-01-08T19:36:30+00:00Added an answer on January 8, 2021 at 7:36 pm

$15\times 3$ in $mod 8$
$\Rightarrow 15\times 3=45$ in $mod 8$
next look for the number that will multiple 8 to give 45 or a number close to 45 but not more than 45
$\Rightarrow 8 \times 5=40$
What must be added to 40 to make it 45 is 5
$\therefore 15\times 3\equiv 5$ in $mod 8$

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