Simplify $3\times 7$ in $mod 10$

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Odinaka_OTyro

Asked: January 7, 20212021-01-07T16:04:04+00:00 2021-01-07T16:04:04+00:00In: Arithmetic, Numbers and Combinatorics

Simplify $3\times 7$ in $mod 10$

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Simplify $3\times 7$ in $mod 10$

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Sengemegz · Accepted Answer · 2021-01-08T20:25:31+00:00

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Sengemegz Moderator

2021-01-08T20:25:31+00:00Added an answer on January 8, 2021 at 8:25 pm

$3\times 7$ in $mod 10$
$\Rightarrow 3\times 7=21$ in $mod 10$
next look for the number that will multiple 10 to give 21 or a number close to 21 but not more than 21
$\Rightarrow 10 \times 2=20$
What must be added to 20 to make it 21? is 1
$\therefore 3\times 7\equiv 1$ in $mod 10$

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Simplify $3\times 7$ in $mod 10$