Swap the numbers, the answer stays the same!
Example: 3 · 9 = 27 and 9 · 3 = 27
So you only have to learn half of all the multiplication facts by heart.
The numbers filled in show the solution.
Example
3+9=27↔9+3=27
For parents
What does this exercise practice?
This exercise teaches the commutative law of multiplication: the order of the factors does not matter.
Common pitfalls
Children are often surprised that the answer really stays the same. It becomes visible on a dot grid, just turn the grid around!
How to practice at home
Arrange buttons into a dot grid, for example 3 rows of 9 buttons. Turn it a quarter turn and count again.
Related: Times array, Key facts, Inverse