Extract:
Isabella: 1,590x8 Jayden: 1,590x10 Michael: 1,600x8 Sarah: 1,600x10
Which student wrote the estimate closest to 1,592 + 8?
Correct Answer: A
Rationale: 1,592/8=199. Isabella: 1,590/8=198.75, error 0.25. Michael: 1,600/8=200, error 1. Jayden: 1,590/10=159, error 40. Sarah: 1,600/10=160, error 39. Isabella’s is closest. Others use wrong divisor or overestimate.