Vertical Addition by Partition with 2-digit Numbers 59 + 70 120 (50 + 70) Add the tens 9 (9 + 0) Add the units 129 Vertical Addition by Partition with 3-digit Numbers 326 + 797 1000 (300 + 700) Add the hundreds 110 (20 + 90) Add the tens 13 (6 + 7) Add the units 1123 |