With Two-Digit Numbers

1a. Multiply one’s column x 1 1 * 1 = 1

1b. Multiply one’s column x 2 1 * 2 = 2 1

2. Add 0 for spacing 21 x 0

3a. Multiply ten’s column x * 1 = 2 0

3b. Multiply ten’s column x * 2 = 4 20

4. Add 21 x = 441

1a. Multiply one’s column x * 4 = 24

1b. Multiply one’s column and Add carried number x * 6 = = 20 4

2. Add 0 for spacing x

3a. Multiply ten’s column x * 4 = 20 0

3b. Multiply one’s column and Add carried number x * 3 = = 17 00

4. Add x =