Overview: 4 questions will be solved this time.Among them
           ☆3 arithmetic calculations
           ☆1 integer calculations

[1/4 Formula]
    Work: Calculate the value of equation 138*25*4 .
    Question type: Mathematical calculation
    Solution:
          138*25*4
        =3450*4
        =13800
    Answer:138*25*4=13800
[2/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75*24
    Solution:
    75*24 = 1800
    Column vertical calculation:

							7	5
✖							2	4
						3	0	0
					1	5	0
					1	8	0	0

[3/4 Formula]
    Work: Calculate the value of equation (13*125)*(3*8) .
    Question type: Mathematical calculation
    Solution:
          (13*125)*(3*8)
        =1625*(3*8)
        =1625*24
        =39000
    Answer:(13*125)*(3*8)=39000
[4/4 Formula]
    Work: Calculate the value of equation (12+24+80)*50 .
    Question type: Mathematical calculation
    Solution:
          (12+24+80)*50
        =116*50
        =5800
    Answer:(12+24+80)*50=5800

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