Overview: 5 questions will be solved this time.Among them
           ☆3 arithmetic calculations
           ☆2 integer calculations

[1/5 Formula]
    Work: Calculate the value of equation 12345*2345+2469*38275 .
    Question type: Mathematical calculation
    Solution:
          12345*2345+2469*38275
        =28949025+2469*38275
        =28949025+94500975
        =123450000
    Answer:12345*2345+2469*38275=123450000
[2/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2469*5
    Solution:
    2469*5 = 12345
    Column vertical calculation:

						2	4	6	9
✖									5
					1	2	3	4	5
					1	2	3	4	5

[3/5 Formula]
    Work: Calculate the value of equation 12345*2345+2469*5*7655 .
    Question type: Mathematical calculation
    Solution:
          12345*2345+2469*5*7655
        =28949025+2469*5*7655
        =28949025+12345*7655
        =28949025+94500975
        =123450000
    Answer:12345*2345+2469*5*7655=123450000
[4/5 Formula]
    Work: Calculate the value of equation 12345*(2345+7655) .
    Question type: Mathematical calculation
    Solution:
          12345*(2345+7655)
        =12345*10000
        =123450000
    Answer:12345*(2345+7655)=123450000
[5/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12345*10000
    Solution:
    12345*10000 = 123450000
    Column vertical calculation:

										1	2	3	4	5
✖										1	0	0	0	0
										0	0	0	0	0
									0	0	0	0	0
								0	0	0	0	0
							0	0	0	0	0
						1	2	3	4	5
						1	2	3	4	5	0	0	0	0

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