Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 74×50
    Solution:
    74×50 = 3700
    Column vertical calculation:

							7	4
✖							5	0
							0	0
					3	7	0
					3	7	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 84×30
    Solution:
    84×30 = 2520
    Column vertical calculation:

							8	4
✖							3	0
							0	0
					2	5	2
					2	5	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 78×50
    Solution:
    78×50 = 3900
    Column vertical calculation:

							7	8
✖							5	0
							0	0
					3	9	0
					3	9	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 55×40
    Solution:
    55×40 = 2200
    Column vertical calculation:

							5	5
✖							4	0
							0	0
					2	2	0
					2	2	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 44×5
    Solution:
    44×5 = 220
    Column vertical calculation:

						4	4
✖							5
					2	2	0
					2	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 54×3
    Solution:
    54×3 = 162
    Column vertical calculation:

						5	4
✖							3
					1	6	2
					1	6	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 48×5
    Solution:
    48×5 = 240
    Column vertical calculation:

						4	8
✖							5
					2	4	0
					2	4	0

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>>注：本次最多计算 7 道题。

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