5th grade math. correct answer will be marked brainliest.

Answer:
common denominator = 80
3/80 and 24/30
Step-by-step explanation:
Same thing as last one, you multiply the denominators of each fraction together. 8x10=80 then multiply the fraction with the opposite denominator, 3x10=30 so 3/80 and 3x8=24 so 24/30.
Answer:
common denominator: 40
3/8 = 15/40
3/10 = 12/40
Step-by-step explanation:
8 x 5 = 40 and 10 × 4 = 40. This means 40 is the common denominator.
To get from 8 to 40 you multiply by 5 and so you multiply 3 by 5. This means the numerator is 15.
To get from 10 to 40 you multiply by 4 and so you multiply 3 by 4. This means the numerator is 12.