Uploaded January 2026 | Updated September 2026, 1 week ago

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🧠 The 11× Trick (Two-Digit Numbers)

Rule:
👉 Add the two digits and put the sum in the middle.

Example

34 × 11

Separate digits → 3 | 4

Add them → 3 + 4 = 7

Insert the sum → 374

✔️ Answer: 374

🚨 When the Sum Is 10 or More (Carry Rule)
Example

58 × 11

Digits → 5 | 8

Add → 13

Put 3 in the middle

Carry 1 to the first digit

Result:

First digit: 5 + 1 = 6

Middle: 3

Last digit: 8

✔️ 638

🔢 Three-Digit Numbers (Still Works!)

Rule: Add neighboring digits from right to left.

Example

314 × 11

Write digits spaced:

3 1 4


Add neighbors:

Right → 4

Middle → 1 + 4 = 5

Left → 3 + 1 = 4

Far left → 3

✔️ 3454