# Understanding Number Relationships: The PrimeSense Clock

### The PrimeSense Clock

We have replaced the numbers around the clock with symbols. Each symbol is made of simple shapes and colors. Some numbers have a single block, others have multiple blocks. Colors seem to indicate something.

Look at 2, 3, 6, and 12…. what do they have in common? What could this mean? Can you find the pattern/logic we used to create this clock?

Selecting some numbers more than once can give you a hint.

PrimeSense uses simple colors and shapes to represent the factors that make up that number, creating a meaningful symbol for every number.

Let’s look at the numbers 2, 3, 6, 12. The number 2 is a prime number and is represented with a single blue block (all prime numbers are represented as a single symbol in the PrimeSense system). You will see that the number 3 is also represented by a single block, that is red this time (also a prime number).

6 on the clock…that is represented by one blue and one red block (all composite numbers demonstrate the prime factors of that number). So, in this case 2×3=6.

Even more interesting is the number 12. There is a red block and two blue blocks. Can you see all the possible prime factors in the number 12?

There are hints as to the factors of any number in the PrimeSense system. The best part, because we are using simple shapes and colors, this tool can be used with very young learners and aid those struggling with putting meaning to common numerals.

Give it a try.