1 paper clip = approx 1 gram so 1000 clips = 1 kg.
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250 and 750, which sum to 1000. The exact sum is 1001.
9 is the best estimate whole number
A best estimate is the best guess that you can give for an answer. It is not really done using a formula, just by comparing things in your mind.
To the nearest ten, 1240, 1050 and 980 respectively.
Best estimate is 30 x 6 = 180 Actual answer is 192.34