Twin72 Twin72
  • 06-08-2015
  • Mathematics
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whats the most accurate estimation of 65 77

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Аноним Аноним
  • 06-08-2015
Addition: 70 + 80 = 150.  You round 65 up because the ones digit is greater than and the same with 77.
Multiplication: Round up since both ones digits are bigger than 5.  70 x 80= 5600.
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