Library›Addition Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

3 + 25

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha28

3 + 25 = 28. Changing the order gives 25 + 3, 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. 1503 + 26RECALL
    29

    Mental addition

    Open this card ↗
  2. 1514 + 16RECALL
    20

    Mental addition

    Open this card ↗
  3. 1524 + 17RECALL
    21

    Mental addition

    Open this card ↗