You can round to different levels when estimating. Rounding to the nearest hundred, 1400 x 6 would be 8400 (1000 x 6 = 6000, 400 x 6 = 2400). To the nearest thousand, the estimate would be 6000. This is less accurate an estimate.
To estimate the product of 1,374 and 6, round 1,374 to 1,400, giving an estimated product of 8,400. Alternatively, rounding to the nearest thousand gives an estimate of 6,000. The more accurate estimate is 8,400 when rounding to the nearest hundred.
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