Library›Subtraction Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaDifference

16 − 1

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha15

16 − 1 = 15. The difference tells you the gap between 1 and 16. Source: Subtraction ↗

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 Subtraction Fluency

A few more worth knowing.

  1. 15316 − 0RECALL
    16

    Mental subtraction

    Open this card ↗
  2. 15417 − 17RECALL
    0

    Mental subtraction

    Open this card ↗
  3. 15517 − 16RECALL
    1

    Mental subtraction

    Open this card ↗