Mathematics - Multiplication - Multi-digit multiplication - Estimation Station

Show a problem like 23×4 and ask 'About how much?' Options: 60, 80, 100, 120. The student estimates by rounding (23≈20, 20×4=80). Do 5 rounds with 2-digit × 1-digit problems. Show the actual answer after guessing. The goal is to build reasonableness checking before learning the algorithm.