This learning resource focuses on teaching students to multiply by 3 using the 'double-then-add' mental math strategy. It starts with a warm-up activity, the '60-Second Brain Dump,' to activate prior knowledge through quick multiplication facts. The main content explains the doubling concept, illustrating that multiplying a number by 3 involves doubling the number and adding it once more to find the total. Through guided practice, students are encouraged to apply this method by solving various multiplication problems step-by-step. The resource concludes with an independent task and a reflective question that prompts students to consider the efficiency of the 'double-then-add' strategy compared to skip-counting.