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4 problems match “common divisors”. Clear

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1. Two-digit common factors of 100 and 150 ●○○○○ 10 ptsHow many positive two-digit integers are factors of both $100$ and $150$?
2. Sum of common divisors ●○○○○ 10 ptsFind the sum of all positive divisors of $50$ that are also divisors of $15$.
3. Common divisors of 48 and 156 ●○○○○ 10 ptsHow many positive divisors do 48 and 156 have in common?
4. Greatest shared divisor of 90 and m ●●○○○ 20 ptsTwo numbers $90$ and $m$ share exactly three positive divisors. What is the greatest of these three common divisors?