Library›Addition Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

12 + 25

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha37

12 + 25 = 37. Changing the order gives 25 + 12, the same sum. Source: Addition ↗

ahamoraReference ↗

Keep the thread going

One answer is a beginning.

Share a little curiosity, or follow it into the full collection.

Flip the full deck →

More from Addition Fluency

A few more worth knowing.

  1. 32412 + 26RECALL
    38

    Mental addition

    Open this card ↗
  2. 32512 + 27RECALL
    39

    Mental addition

    Open this card ↗
  3. 32613 + 17RECALL
    30

    Mental addition

    Open this card ↗