Vertical Addition by Partition with 2-digit Numbers 55 + 73 120 (50 + 70) Add the tens 8 (5 + 3) Add the units 128 Vertical Addition by Partition with 3-digit Numbers 609 + 695 1200 (600 + 600) Add the hundreds 90 (0 + 90) Add the tens 14 (9 + 5) Add the units 1304 |