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Addition

Level 11 / build-up

3d + 2d (no carry)

3 visual steps / answer-window addition

1. Fill hundreds

Step 1: Fill hundreds
raw windows
running strip
Hundreds window: 3 + 0 = 3. Release 3.

Hundreds window: 3 + 0 = 3. Release 3.

2. Fill tens

Step 2: Fill tens
raw windows
running strip
Tens window: 1 + 4 = 5. Release 5.

Tens window: 1 + 4 = 5. Release 5.

3. Fill ones

Step 3: Fill ones
raw windows
running strip
Ones window: 2 + 5 = 7. Release 7.

Ones window: 2 + 5 = 7. Release 7.

Practice Level 11

A few quick rounds make digit release automatic; carry is the only thing to keep.

Start Level