AI Lesson

THE MYSTERY NUMBER CHALLENGE: Determining Unknown Whole Numbers

In this lesson, you’ll become a number detective. You’ll use multiplication and division to figure out the mystery number hiding in the equation. Let’s crack the case using clues we already know! Texas TEKS 3.5A — Represent and solve problems involving multiplication or division with an unknown represented by a symbol or variable. Maryland MCCRS (2025) Grade 3 — 3.OA.A.3: Use multiplication and division within 100 to solve word problems involving equal groups, arrays, and measurement quantities, using a symbol for the unknown number. 3.OA.A.4: Determine the unknown number in a multiplication or division equation relating three whole numbers.TEKS: 3.5A – Represent and solve problems with unknowns