Add 3-digit numbers
1 Add 3-digit numbers: no regrouping 
2 Add: regroup ones
3 Add: regroup tens
4 Add 3-digit numbers: regrouping
5 Check-up (1) 
6 Word problem (1)
7 Word problem (2)
8 Word problem (3)
9 Check-up (2)
10 Check-up (3)