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MATH / Find the units digit of 29⋅79+31⋅81.

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

Find the units digit of 29⋅79+31⋅8129 \cdot 79 + 31 \cdot 81.
Plain-text mathematical notation (without MathML)
Find the units digit of 29⋅79+31⋅81.
Original LaTeX notation
Find the units digit of $29 \cdot 79 + 31 \cdot 81$.

level

Level 2

type

Number Theory

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Source and history

Official source

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