100000001*9999999900000001_ Mathematical calculation

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           ☆1 integer calculations

[1/1 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 100000001*9999999900000001
    Solution:
    100000001*9999999900000001 = 1000000000000000000000001
    Column vertical calculation:

																	1	0	0	0	0	0	0	0	1
✖										9	9	9	9	9	9	9	9	0	0	0	0	0	0	0	1

																	1	0	0	0	0	0	0	0	1
																0	0	0	0	0	0	0	0	0
															0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0
												0	0	0	0	0	0	0	0	0
											0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0
									9	0	0	0	0	0	0	0	9
								9	0	0	0	0	0	0	0	9
							9	0	0	0	0	0	0	0	9
						9	0	0	0	0	0	0	0	9
					9	0	0	0	0	0	0	0	9
				9	0	0	0	0	0	0	0	9
			9	0	0	0	0	0	0	0	9
		9	0	0	0	0	0	0	0	9

	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

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																	1	0	0	0	0	0	0	0	1
✖										9	9	9	9	9	9	9	9	0	0	0	0	0	0	0	1

																	1	0	0	0	0	0	0	0	1
																0	0	0	0	0	0	0	0	0
															0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0
												0	0	0	0	0	0	0	0	0
											0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0
									9	0	0	0	0	0	0	0	9
								9	0	0	0	0	0	0	0	9
							9	0	0	0	0	0	0	0	9
						9	0	0	0	0	0	0	0	9
					9	0	0	0	0	0	0	0	9
				9	0	0	0	0	0	0	0	9
			9	0	0	0	0	0	0	0	9
		9	0	0	0	0	0	0	0	9

	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

																	1	0	0	0	0	0	0	0	1
✖										9	9	9	9	9	9	9	9	0	0	0	0	0	0	0	1

																	1	0	0	0	0	0	0	0	1
																0	0	0	0	0	0	0	0	0
															0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0
												0	0	0	0	0	0	0	0	0
											0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0
									9	0	0	0	0	0	0	0	9
								9	0	0	0	0	0	0	0	9
							9	0	0	0	0	0	0	0	9
						9	0	0	0	0	0	0	0	9
					9	0	0	0	0	0	0	0	9
				9	0	0	0	0	0	0	0	9
			9	0	0	0	0	0	0	0	9
		9	0	0	0	0	0	0	0	9

	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

																	1	0	0	0	0	0	0	0	1
✖										9	9	9	9	9	9	9	9	0	0	0	0	0	0	0	1

																	1	0	0	0	0	0	0	0	1
																0	0	0	0	0	0	0	0	0
															0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0
												0	0	0	0	0	0	0	0	0
											0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0
									9	0	0	0	0	0	0	0	9
								9	0	0	0	0	0	0	0	9
							9	0	0	0	0	0	0	0	9
						9	0	0	0	0	0	0	0	9
					9	0	0	0	0	0	0	0	9
				9	0	0	0	0	0	0	0	9
			9	0	0	0	0	0	0	0	9
		9	0	0	0	0	0	0	0	9

	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1