Library›Subtraction Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaDifference

28 − 13

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

28 − 13 = 15. The difference tells you the gap between 13 and 28. 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. 42328 − 12RECALL
    16

    Mental subtraction

    Open this card ↗
  2. 42428 − 11RECALL
    17

    Mental subtraction

    Open this card ↗
  3. 42528 − 10RECALL
    18

    Mental subtraction

    Open this card ↗