LibraryAddition FluencyOne card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

0 + 30

Think it. Then flip it.
ahamoraTap to reveal
Back to the cue
Math & LogicOne small aha
Your new aha30

0 + 30 = 30. Changing the order gives 30 + 0, 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. 2421 + 29RECALL
    30

    Mental addition

    Open this card ↗
  2. 2431 + 30RECALL
    31

    Mental addition

    Open this card ↗
  3. 2442 + 28RECALL
    30

    Mental addition

    Open this card ↗