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The answer depends on what you wish to do with the number. If you wish to multiply by 49 or 50 I would suggest estimate it as 0.11 to give 0.11*50 = 5.5. If you wish to multiply by 85 I would suggest estimating it as 0.1 and then 0.1*90 will give 9

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7y ago

What else can I help you with?