To the nearest ten, 20
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200 x 24 = 4800
55 x 20 = 1100
0.1207
24/8 = 3 so 240/8 = 30.That leaves a remainder of 4 and 4/8 = 0.5 So the answer is 30.5: exact answer, no need for estimate. No sweat!
900 would be a fair estimate