3×60=180 seconds (60 seconds in 1 minute)
180×200,000,000= 36,000,000,000 calculations
I would suggest you to use quickmath it helps a lot.
Yes
Yes
No
No hopefully I helped

and
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
Hello!
The 2 activities which represent data collecting are :
- A. Graphing the heights of baseball players
- C. Asking people what their favorite food is