458
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There are 30 individual whole numbers between 429 and 460. If you include decimal numbers, then the answer is infinite.
All numbers can be rounded to the nearest ten.
Suppose you are asked to evaluate a quotient like 923/462. You have several options. You could choose 900 and 500 as compatible numbers for the two given numbers and then your estimated quotient would be 900/500 = 1.8. Or You could choose 920 and 460 as the compatible numbers for them and then your estimated quotient would be 920/460 = 2.0. So the question is essentially, what compatible numbers did you pick and using them, what was the quotient. There is no correct answer to picking compatible numbers. Any estimation is a trade-off between simplicity and accuracy. Incidentally, a more accurate answer is 1.9978 (approx), but even that is not perfect!
10% of 460 = 460*10/100 = 46
420 = 400 + 20 others are 310 = 400 - 90 530 = 400 +130 460 = 400 + 60 370 = 400 - 30 so as 20 is smallest the answer is 420