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Unit test for the fourth grade of primary school mathematics, Volume II, Volume VIII.
2.2 1- 1=20 (m) 50x20= 1000 (m)

3,9-1= 8 (points)

4, 20/(3- 1)= 10 (segment) 10x5=50 (point)

5.400/20 =20 (surface)

6. 16- 1= 15 (person) 15*4=60 people 60*60.