Sum in base‑9

Find the sum of the base‑9 numbers $303478$ , $150732$ , and $264305$ , and express the answer in base 9.

~3 minAnswer checked instantlyadditionbase conversion

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VII. Scales of Notation, Examples VII.a, No. 2

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