Vertical Addition by Partition with 2-digit Numbers 52 + 64 110 (50 + 60) Add the tens 6 (2 + 4) Add the units 116 Vertical Addition by Partition with 3-digit Numbers 974 + 671 1500 (900 + 600) Add the hundreds 140 (70 + 70) Add the tens 5 (4 + 1) Add the units 1645 |