PBA 2 Practice Question Grade 4 Mathematics - SkillBuilder + MAP Rehearsal

Grade 4 Mathematics - SkillBuilder + MAP Rehearsal PBA 2

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Maya was finding factor pairs for the number 40. Maya’s list of factor pairs for 40 is below:
1 and 40
2 and 20
4 and 10
5 and 8
How can Maya best explain that her answers are correct?