Vertical Addition by Partition with 2-digit Numbers 40 + 78 110 (40 + 70) Add the tens 8 (0 + 8) Add the units 118 Vertical Addition by Partition with 3-digit Numbers 200 + 108 300 (200 + 100) Add the hundreds 0 (0 + 0) Add the tens 8 (0 + 8) Add the units 308 |