Vertical Addition by Partition with 2-digit Numbers 79 + 83 150 (70 + 80) Add the tens 12 (9 + 3) Add the units 162 Vertical Addition by Partition with 3-digit Numbers 408 + 952 1300 (400 + 900) Add the hundreds 50 (0 + 50) Add the tens 10 (8 + 2) Add the units 1360 |