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Selected Problems— 25 total
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1. #135 Prime Factorization
Grades 6-8▮▮▮▮Extended
1
×2. #137 Largest Prime Factor
Grades 5-7▮▮▯▯Medium
1
×3. #358 Sum Prime Factors
Grades 6-8▮▮▯▯Medium
1
×4. #431 Prime Factorization Race
Grades 6-8▮▮▯▯Medium
1
×5. #432 Distinct Prime Factors
Grades 6-8▮▮▯▯Medium
1
×6. #444 Coprime Pairs in Range
Grades 7-9▮▮▯▯Medium
1
×7. #445 Pairwise Coprime Check
Grades 6-8▮▮▮▯Long
1
×8. #447 Common Factors Count
Grades 5-7▮▮▯▯Medium
1
×9. #504 Find the Number from Its Prime Factorization
Grades 6-8▮▯▯▯Short
1
×10. #913 Foundational Simplify Fraction
Grades 4-6▮▮▯▯Medium
1
×11. #999 Foundational Largest Power of Two Factor
Grades 4-6▮▮▯▯Medium
1
×12. #1249 Count Common Multiples in a Range
Grades 4-6▮▮▮▯Long
1
×13. #1279 LCM Scheduling Problem
Grades 6-8▮▮▯▯Medium
1
×14. #1396 Ratio Simplification
Grades 6-8▮▮▯▯Medium
1
×15. #1417 GCF Two Numbers
Grades 6-8▮▮▯▯Medium
1
×16. #1418 LCM Two Numbers
Grades 6-8▮▮▮▯Long
1
×17. #1427 GCD By Subtraction
Grades 6-8▮▮▯▯Medium
1
×18. #1435 GCD By Euclidean Algorithm
Grades 7-9▮▮▯▯Medium
1
×19. #1556 Count Divisible by Either of Two Numbers
Grades 6-8▮▮▮▯Long
1
×20. #1557 Count Divisible by One but Not Another
Grades 6-8▮▮▯▯Medium
1
×21. #1618 Smallest Count With Equal Remainders
Grades 6-8▮▮▮▯Long
1
×22. #1630 How Many Common Group Sizes
Grades 6-8▮▮▯▯Medium
1
×23. #1632 GCD or LCM via Prime Factorization
Grades 6-8▮▮▯▯Medium
1
×24. #3513 When Two Repeating Events Happen Together
Grades 4-6▮▮▯▯Medium
1
×25. #3544 Multiples of Either Number Without Double Counting
Grades 4-6▮▮▮▮Extended
1
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