Vertical Addition by Partition with 2-digit Numbers 56 + 11 60 (50 + 10) Add the tens 7 (6 + 1) Add the units 67 Vertical Addition by Partition with 3-digit Numbers 566 + 341 800 (500 + 300) Add the hundreds 100 (60 + 40) Add the tens 7 (6 + 1) Add the units 907 |