From the archive
Tuesday, 1 September 2026
SUMPRODUCT multiplies matching entries from two ranges and adds the results — a weighted score in one step instead of three multiplications and a sum.
You handle vendor selection for a manufacturing company's procurement team. Four vendors have been scored out of 10 on quality, price and delivery, and the weight each criterion carries toward the final decision sits in row 2 — 40% quality, 35% price, 25% delivery. Work out each vendor's overall weighted score in column E, in one formula that pairs each vendor's three scores with the matching weights.
A new exercise every morning, plus every day that came before it — a back catalogue that grows by one a day, whether or not you were here for it.
The last 14 days. Today's challenge is free while your streak is alive; Pro opens every past day too.