Grade 5 Mathematics - Skill Builder + Massachusetts Comprehensive Assessment System (MCAS) Rehearsal Multiplication of whole numbers

Grade 5 Mathematics - Skill Builder + Massachusetts Comprehensive Assessment System (MCAS) Rehearsal Multiplication of whole numbers

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Amy multiplied 315 x 101 using mental math. Her strategy was to switch the problem to 316 x 100. She got an answer of 31,600, and concluded that 315 x 101 is also equal to 31,600. Is her strategy valid?