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Math Gym
Multiplication Guide

Multiplication Level 28: 4d x 4d (medium th). multi-digit window train.

1. Left Edge

1. Left Edge
Use the highlighted left edge pair.
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Use the highlighted left edge pair. Carry waits for settle.

2. 2-Pair Window

2. 2-Pair Window
Add both highlighted pairs.
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Add both highlighted pairs. Carry waits for settle.

3. 3-Pair Window

3. 3-Pair Window
Add all 3 highlighted pairs.
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Add all 3 highlighted pairs. Carry waits for settle.

4. 4-Pair Center

4. 4-Pair Center
Add all 4 highlighted pairs.
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Add all 4 highlighted pairs. Carry waits for settle.

5. 3-Pair Right Window

5. 3-Pair Right Window
Add all 3 highlighted pairs.
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Add all 3 highlighted pairs. Carry waits for settle.

6. 2-Pair Right Window

6. 2-Pair Right Window
Add both highlighted pairs.
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Add both highlighted pairs.

7. 1-Pair Right Edge

7. 1-Pair Right Edge
Use the highlighted right edge pair.
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Use the highlighted right edge pair.

8. Settle strip

8. Settle strip
Settle once.
Keep ones; carry moves left.raw windows
settled strip
20 | 22 | 19 | 26 | 13 | 7 | 3 -> 22417373.