Library›Addition Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

28 + 29

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha57

28 + 29 = 57. Changing the order gives 29 + 28, 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. 49328 + 30RECALL
    58

    Mental addition

    Open this card ↗
  2. 49429 + 29RECALL
    58

    Mental addition

    Open this card ↗
  3. 49529 + 30RECALL
    59

    Mental addition

    Open this card ↗