20 more than 3456

(a)  

400 more than 3756

(a)  

3000 more than 4589

(a)  

1 less than 9210

(a)  

20 less than 4010

(a)  

600 less than 3754

(a)  

take away 1239 from 5609

(a)  

Find the Difference between the largest 4 digit number and the smallest 3 digit number

(a)