Basic 5Mathematics20 min

Prime, Composite, Even, and Odd Sieve

Learners arrange bottle tops into arrays to decide which numbers have many factors.

Sort numbers by the arrays they can make.

A class club has bottle tops for number games. Some numbers make many rectangles, some make only one pair, and some split evenly into twos.

Prime, Composite, Even, and Odd Sieve illustration

Learners arrange bottle tops into arrays to decide which numbers have many factors.

Classify 24, 29, and 31.

  1. 24 makes arrays such as 1 x 24, 2 x 12, 3 x 8, and 4 x 6, so it is composite and even.
  2. 29 and 31 have only 1 and themselves as factors, so they are prime.