Vertical Addition by Partition with 2-digit Numbers 25 + 37 50 (20 + 30) Add the tens 12 (5 + 7) Add the units 62 Vertical Addition by Partition with 3-digit Numbers 709 + 143 800 (700 + 100) Add the hundreds 40 (0 + 40) Add the tens 12 (9 + 3) Add the units 852 |