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can you instantly find the greatest and the smallest numbers in each row

Q. Can you instantly find the greatest and the smallest numbers in each row?
2.   1473, 89423, 100, 5000, 310

3.   1834, 75284, 111, 2333, 450 

4.   2853, 7691, 9999, 12002, 124

Answers (1)
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By Observing the number of digits and digit in the leftmost place can straight away tell us about the greatest and smallest number

(2)  1473, 89423, 100, 5000, 310

89423 is the greatest while 100 is the smallest

(3) 1834, 75284, 111, 2333, 450

75284 is the greatest 111 while is the smallest

(4)  2853, 7691, 9999, 12002, 124

12002 is the greatest while 124 is the smallest

 

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