Basic 4Mathematics22 min

Highest Common Factor and Lowest Common Multiple

Sorting bottle tops into matching group sizes for two class teams.

Find what two numbers share.

Two teams have different numbers of bottle tops. Find the biggest group size that fits both teams and the first total both teams can make.

Highest Common Factor and Lowest Common Multiple illustration

Sorting bottle tops into matching group sizes for two class teams.

Find the HCF and LCM of 12 and 18.

  1. Factors of 12 include 1, 2, 3, 4, 6, 12. Factors of 18 include 1, 2, 3, 6, 9, 18. The highest common factor is 6.
  2. Multiples of 12 are 12, 24, 36. Multiples of 18 are 18, 36. The lowest common multiple is 36.