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 2+33+444+5555+66666+777777+8888888+99999999 .
    Question type: Mathematical calculation
    Solution:
          2+33+444+5555+66666+777777+8888888+99999999
        =35+444+5555+66666+777777+8888888+99999999
        =479+5555+66666+777777+8888888+99999999
        =6034+66666+777777+8888888+99999999
        =72700+777777+8888888+99999999
        =850477+8888888+99999999
        =9739365+99999999
        =109739364
    Answer:2+33+444+5555+66666+777777+8888888+99999999=109739364
[2/5 Integer column vertical calculation]
    Question type: Integer division
    Original question: 231/47
    Solution:
    231/47 = 4 ··· ··· 43
    Column vertical calculation:

					4
4	7	丿	2	3	1
			1	8	8
				4	3

[3/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 985*124
    Solution:
    985*124 = 122140
    Column vertical calculation:

								9	8	5
✖								1	2	4
							3	9	4	0
						1	9	7	0
						9	8	5
					1	2	2	1	4	0

[4/5 Formula]
    Work: Calculate the value of equation 886*447+448*114 .
    Question type: Mathematical calculation
    Solution:
          886*447+448*114
        =396042+448*114
        =396042+51072
        =447114
    Answer:886*447+448*114=447114
[5/5 Formula]
    Work: Calculate the value of equation 3.85+2.85+4.85+6.85+5.85+7.85 .
    Question type: Mathematical calculation
    Solution:
          3.85+2.85+4.85+6.85+5.85+7.85
        =6.7+4.85+6.85+5.85+7.85
        =11.55+6.85+5.85+7.85
        =18.4+5.85+7.85
        =24.25+7.85
        =32.1
    Answer:3.85+2.85+4.85+6.85+5.85+7.85=32.1

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