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

[1/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 375*498
    Solution:
    375*498 = 186750
    Column vertical calculation:

								3	7	5
✖								4	9	8
							3	0	0	0
						3	3	7	5
					1	5	0	0
					1	8	6	7	5	0

[2/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 975*433
    Solution:
    975*433 = 422175
    Column vertical calculation:

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

[3/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 222*666
    Solution:
    222*666 = 147852
    Column vertical calculation:

								2	2	2
✖								6	6	6
							1	3	3	2
						1	3	3	2
					1	3	3	2
					1	4	7	8	5	2

[4/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 887*545
    Solution:
    887*545 = 483415
    Column vertical calculation:

								8	8	7
✖								5	4	5
							4	4	3	5
						3	5	4	8
					4	4	3	5
					4	8	3	4	1	5

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