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: 24×2
    Solution:
    24×2 = 48
    Column vertical calculation:

						2	4
✖							2
						4	8
						4	8

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×8
    Solution:
    90×8 = 720
    Column vertical calculation:

						9	0
✖							8
					7	2	0
					7	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 6×29
    Solution:
    6×29 = 174
    Column vertical calculation:

							6
✖						2	9
						5	4
					1	2
					1	7	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×9
    Solution:
    20×9 = 180
    Column vertical calculation:

						2	0
✖							9
					1	8	0
					1	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×8
    Solution:
    24×8 = 192
    Column vertical calculation:

						2	4
✖							8
					1	9	2
					1	9	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×6
    Solution:
    42×6 = 252
    Column vertical calculation:

						4	2
✖							6
					2	5	2
					2	5	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×3
    Solution:
    50×3 = 150
    Column vertical calculation:

						5	0
✖							3
					1	5	0
					1	5	0

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>>注：本次最多计算 7 道题。

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