Cracking the Code

The Code Crackers
Topic: Number Theory
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It's Nicole and Emily's first day of seventh grade! They receive their P.E locker combinations from their block teacher, Mrs. Kayes. However, Nicole's enemy (Taylor) is determined to ruin Nicole's first day. She scribbles out a number on Nicole's slip of paper, leaving it up to Emily and Nicole to figure out what the missing digit is. Can they use the power of mathematics and find the missing number before time runs out or will they fail and ruin Nicole's P.E?

Common Core Standards: SMP
Problem #: 
98 (2018-2019)
Problem Difficulty Level: 2 [?]