Multiplication in base‑7

Multiply the base‑7 numbers $6431$ and $35$ , and express the product in base 7.

~4 minAnswer checked instantlymultiplicationbase conversion

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VII. Scales of Notation, Examples VII.a, No. 6

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).