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What is the best estimate for this product 81 x 409?

Anonymous

∙ 13y ago

Updated: 12/10/2022

The simple, but crude, estimate would be 80*400 = 32000 which is 3.4% off the correct answer of 33129.

I would go for 80 * 410 which is 32800, which is less than 1% off. When multiplying, if you round one number up, you round the other down.

Wiki User

∙ 13y ago

What else can I help you with?

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I suggest 80 * 410 = 80 * 400 + 80 * 10 = 32000 + 800 = 32800.

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