Below are the Common Core State Standards that most closely relate to the following lesson.
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Grades: 6-8, 9-12
Mathematics - Grade 6 - The Number System
6.NS.B - Compute fluently with multi-digit numbers and find common factors and multiples.
Mathematics - Grade 7 - Ratios & Proportional Relationships
7.RP.A - Analyze proportional relationships and use them to solve real-world and mathematical problems.
Standards for Mathematical Practice
MP1 - Make sense of problems and persevere in solving them.
MP6 - Attend to precision.