What is the best estimate for the product of 289 and 7
2 answers:
The best estimate is 2100. Because 289 rounded to the nearest hundredth is 300, and by using simple time tables (3 * 7 = 21), we can determine that 300 * 7 = 2100. But if you want an even closer estimate, do this: (200 * 7) + (90 * 7) = (1400) + (630) = 2030. And to get the exact answer... (200 * 7) + (80 * 7) + (9 * 7) = (1400) + (560) + (63) = (1960) + (63) = 2023. 2032 is the exact answer. The two solutions above involve the usage of time tables and place-value manipulation - (ab) * c = a*c + b*c, in which ab represents a 2 digit number)
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