NCERT Figure it Out 3 - Q4 - We Distribute, Yet Things Multiply

Question: In any 2-by-2 calendar square, compare the products of the two diagonals. Explain the observation.

Answer: Diagonal products differ by 7: (a+1)(a+7) - a(a+8) = 7.

Full step-by-step NCERT solution with diagrams on Something by Zero.