jerragroce jerragroce
  • 23-08-2017
  • Mathematics
contestada

What is the best estimate for the product of 289 and 7

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latashacmoore latashacmoore
  • 23-08-2017
I would estimate it as (300 x 7) = 2100 

Then I would subtract (11 x 7) + 77 from that to get the exact answer of 2023 

~~~~~~~~~~ 
I didn't use a calculator or paper. The 'trick' is to notice that 289 = (300 - 11)
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