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	Java Games: Matching, concentration, word search, and flashcards.

Estimation

Round to the highest place

Tools

A	B
21,	20
46	50
124	100
12	10
547	500
4875	5000
874	900
6512	7000
540	500
16	20
471	500
369	400
498	500
1247	1000
357	400
789	800
54	50
67	70
657	700
2475	2000