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: 15×40
    Solution:
    15×40 = 600
    Column vertical calculation:

							1	5
✖							4	0
							0	0
						6	0
						6	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×2
    Solution:
    26×2 = 52
    Column vertical calculation:

						2	6
✖							2
						5	2
						5	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×2
    Solution:
    16×2 = 32
    Column vertical calculation:

						1	6
✖							2
						3	2
						3	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×2
    Solution:
    18×2 = 36
    Column vertical calculation:

						1	8
✖							2
						3	6
						3	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×4
    Solution:
    15×4 = 60
    Column vertical calculation:

						1	5
✖							4
						6	0
						6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×20
    Solution:
    26×20 = 520
    Column vertical calculation:

							2	6
✖							2	0
							0	0
						5	2
						5	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×20
    Solution:
    16×20 = 320
    Column vertical calculation:

							1	6
✖							2	0
							0	0
						3	2
						3	2	0

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>>注：本次最多计算 7 道题。

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