Library›Multiplication Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaProduct

13 × 15

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha195

13 groups of 15 make 195. Reversing the factors, 15 × 13, gives the same product. Source: Multiplication table ↗

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 Multiplication Fluency

A few more worth knowing.

  1. 22413 × 16RECALL
    208

    Mental multiplication

    Open this card ↗
  2. 22513 × 17RECALL
    221

    Mental multiplication

    Open this card ↗
  3. 22613 × 18RECALL
    234

    Mental multiplication

    Open this card ↗