Question 104322
I think the missing numbers are- 35,49, 77 and 91 (in that order) because 63-21=42. 42/3 places is (you have to include the space "21" uses)=14. Add 14 to 21= 35 and subtract 14 from 63 or add 14 to 35= 49. Then add 14 to 63=77 finally add 14 to 77 to get 91.