2050m = 2km 50m 4.6t = 4600kg 75 m2 = 750 m2 = 7500 m2。

20x3 = 60min12-1=11

Exercise 16

1 1463km7500m2 365 days 320KG 240L 13 seconds.

2 4.65 520000 3000 3000000 6300 2 24 9.4

3 17 is 20 o'clock-16 is 40 o'clock =40 o'clock 40X7=280 o'clock 280/60 is greater than 4, so it can be completed.

4 1 m3 = 100000 cubic centimeters, so you need 100000 small cubes with a volume of 1 cubic centimeters.

1x 1000000 = 100000cm = 10km

It needs 65,438+0,000,000 small cubes with a length of 65,438+00 km.