58.2222
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524 would become 520 and 9 would become 10. 520 divided by ten is 52.
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The above answer is more than 10% away from the true value. 524/9 = 58.22... recurring.
Alternative answer with a bit more work but a much greater accuracy
524 = 540 - 16 = 540 - (18 - 2) = 540 - 18 + 2
That is, 524 = 540 - 18 + a small number.
Then 524/9 = 540/9 - 18/9 + a small fraction
= 60 - 2 + a small fraction
= 58 + a small fraction.
an answer that is less than half a percent in error!