"Eleven is a generous number. It makes room between things so something new can appear."

The Eleven Trick

To multiply any two-digit number by 11 — when the digits add up to 9 or less — simply add the two digits together and slide the sum between them.

43 \times 11

4 7 3

4 + 3 = 7 → 473

62 \times 11

6 8 2

6 + 2 = 8 → 682

Your turn. Solve each one in your head.

24 \times 11 =

71 \times 11 =

36 \times 11 =

45 \times 11 =

Insight Eleven makes space. Add the digits, slide the sum between them, and the answer appears.