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: 42×4
    Solution:
    42×4 = 168
    Column vertical calculation:

						4	2
✖							4
					1	6	8
					1	6	8

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 49×4
    Solution:
    49×4 = 196
    Column vertical calculation:

						4	9
✖							4
					1	9	6
					1	9	6

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×7
    Solution:
    12×7 = 84
    Column vertical calculation:

						1	2
✖							7
						8	4
						8	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×4
    Solution:
    52×4 = 208
    Column vertical calculation:

						5	2
✖							4
					2	0	8
					2	0	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×4
    Solution:
    62×4 = 248
    Column vertical calculation:

						6	2
✖							4
					2	4	8
					2	4	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 69×4
    Solution:
    69×4 = 276
    Column vertical calculation:

						6	9
✖							4
					2	7	6
					2	7	6

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 11×4
    Solution:
    11×4 = 44
    Column vertical calculation:

						1	1
✖							4
						4	4
						4	4

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>>注：本次最多计算 7 道题。

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