LibraryAddition FluencyOne card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

10 + 25

Think it. Then flip it.
ahamoraTap to reveal
Back to the cue
Math & LogicOne small aha
Your new aha35

10 + 25 = 35. Changing the order gives 25 + 10, 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. 30210 + 26RECALL
    36

    Mental addition

    Open this card ↗
  2. 30310 + 27RECALL
    37

    Mental addition

    Open this card ↗
  3. 30410 + 28RECALL
    38

    Mental addition

    Open this card ↗