Column subtraction
Success criterea
3283
2062
4449
2072
1299
678
6016
2837
9894
2841
4945
844
8721
5319
3714
2891
5869
3178
6235
5465
4512
3670
1489
706
6094
2305
4976
9000
4687
3422
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Do your working out below.
Challenge
The local library owns 5324 books. 1279 have currently been taken home by readers. How many are left in the library at the moment?