Skip to content

Learn

Addition

Level 26 / mastery

4d + 4d (no carry)

5 visual steps / large answer-window addition

1. Fill thousands

Step 1: Fill thousands
raw windows
running strip
Thousands window: 2 + 5 = 7. Release 7.

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

2. Fill hundreds

Step 2: Fill hundreds
raw windows
running strip
Hundreds window: 4 + 2 = 6. Release 6.

Hundreds window: 4 + 2 = 6. Release 6.

3. Fill tens

Step 3: Fill tens
raw windows
running strip
Tens window: 3 + 6 = 9. Release 9.

Tens window: 3 + 6 = 9. Release 9.

4. Fill ones

Step 4: Fill ones
raw windows
running strip
Ones window: 1 + 4 = 5. Release 5.

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

5. Read answer

Step 5: Read answer
Settle onceThe visible windows already read left to right.raw windows
settled digits
Read 7695; estimate before submit.

Read 7695; estimate before submit.

Practice Level 26

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

Start Level