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Primary school textbooks are all exercises in the first volume of the fifth grade.
One question, all 4 cubic centimeters.

Question 2' 10cm3 4dm3 40m3

5 questions; 50 cm =0.5 m

v =abh

=50 times 30 times 0.5

= 1500 times 0.5

=750 cubic meters

Question 6' 30 times 30 times 30.

=900 times 30

= 27,000 cubic centimeters

Question 7 v=abh

=2 times 2 times 0.6

=4 times 0.6

=2.4 square decimeter

2.4 divided by 4=0.6 cubic decimeter

A quarter of each person

8 questions, 24 times 3 times 500.

=7.2 times 500

= 36,000 cubic decimeters

36000 cubic decimeter =360 cubic meters