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: 70×200
    Solution:
    70×200 = 14000
    Column vertical calculation:

								7	0
✖							2	0	0
								0	0
							0	0
					1	4	0
					1	4	0	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×300
    Solution:
    22×300 = 6600
    Column vertical calculation:

								2	2
✖							3	0	0
								0	0
							0	0
						6	6
						6	6	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×400
    Solution:
    22×400 = 8800
    Column vertical calculation:

								2	2
✖							4	0	0
								0	0
							0	0
						8	8
						8	8	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×2
    Solution:
    31×2 = 62
    Column vertical calculation:

						3	1
✖							2
						6	2
						6	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 51×2
    Solution:
    51×2 = 102
    Column vertical calculation:

						5	1
✖							2
					1	0	2
					1	0	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×4
    Solution:
    50×4 = 200
    Column vertical calculation:

						5	0
✖							4
					2	0	0
					2	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×4
    Solution:
    24×4 = 96
    Column vertical calculation:

						2	4
✖							4
						9	6
						9	6

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>>注：本次最多计算 7 道题。

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