Record the strategy used to solve addition and subtraction word problems

1.		Add it up: Addition with regrouping 314+428
2.		Add it up: Addition with regrouping 628+347
3.		Add it up: Addition with regrouping 249+344
4.		Add it up: Addition with regrouping 638+143
5.		Add it up: Addition with regrouping 773+219
6.		Add it up: Addition with regrouping 315+27
7.		Add it up: Addition with regrouping 259+28
8.		Add it up: Addition with regrouping 437+44
9.		Add it up: Addition with regrouping 673+19
10.		Add it up: Addition with regrouping 536+38
11.		Add it up: 583+228
12.		Add it up: 509+199
13.		Add it up: 341+189
14.		Add it up: 1288+252
15.		Add it up: 2273+339
16.		Add it up: 6082+889
17.		Take it away: Subtraction with decomposition 791-338
18.		Take it away: Subtraction with decomposition 874-258
19.		Take it away: Subtraction with decomposition 362-139=?
20.		Take it away: Subtraction with decomposition 984-427=?
21.		Take it away: Subtraction with decomposition 653-137=?