I've called mirage operation to any mathematical operation whose result doesn't change when the digits of its operands are reversed. So, 31 · 26 and 48 + 95 are mirage operations because
31 · 26 = 62 · 13 (= 806)
48 + 95 = 59 + 84 (= 143)
Who can find mirage multiplications and mirage additions?
I wanted my pupils to solve this challenge of Pepe Chapuzas's... It was his classmate Nina Guindilla, again, who did it... She matched operands with lines...
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