Question from angela, a student:

What do we call the numbers that cannot be arranged into 2-row arrays?

Angela,

Did you try some?

Two can be arranged in a 2 row array Three can't be arranged in a 2 row array Four can be arranged in a 2 row array What about five and six?

Two can be arranged in a 2 row array

Three can't be arranged in a 2 row array

Four can be arranged in a 2 row array

What about five and six?

Which numbers can be arranged in a two 2 array? Which can't?

Penny