Zero insertion
Annie and Blanka each wrote one double-digit number, which started with a seven. The girls chose different numbers. Then, each inserted a zero between the two digits, giving them a three-digit number. Everyone subtracted their original two-digit number from him. The result surprised them. Determine how their results differed.
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algebraarithmeticbasic operations and conceptsnumbersthemes, topicsGrade of the word problem
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