LibraryAddition FluencyOne card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

0 + 9

Think it. Then flip it.
ahamoraTap to reveal
Back to the cue
Math & LogicOne small aha
Your new aha9

0 + 9 = 9. Changing the order gives 9 + 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. 111 + 1RECALL
    2

    Mental addition

    Open this card ↗
  2. 121 + 2RECALL
    3

    Mental addition

    Open this card ↗
  3. 131 + 3RECALL
    4

    Mental addition

    Open this card ↗