Vertical Addition by Partition with 2-digit Numbers 71 + 49 110 (70 + 40) Add the tens 10 (1 + 9) Add the units 120 Vertical Addition by Partition with 3-digit Numbers 433 + 326 700 (400 + 300) Add the hundreds 50 (30 + 20) Add the tens 9 (3 + 6) Add the units 759 |