Vertical Addition by Partition with 2-digit Numbers 40 + 54 90 (40 + 50) Add the tens 4 (0 + 4) Add the units 94 Vertical Addition by Partition with 3-digit Numbers 104 + 323 400 (100 + 300) Add the hundreds 20 (0 + 20) Add the tens 7 (4 + 3) Add the units 427 |