PlumoBOX

Montessori cards

Compose and decompose numbers with Montessori cards.

Each place (units, tens, hundreds, thousands) is a coloured card. Pick a value for each place - the number is composed and you see its decomposition '300 + 40 + 7'.

Learning objectives
  • Grade 1
    Discover the ten as a group of ten units. The child uses two cards (units, tens) and sees that 23 is 20 and 3.
  • Grade 2
    Move up to the hundred. The child sees that 347 is 300 + 40 + 7, and that each digit's place changes its value.
  • Grade 3
    Consolidate reading numbers up to 999. The cards make the role of the inner zero visible: 305 is 300 + 5, not 35.
  • Grade 4
    Introduce thousands. The child organises numbers into classes (thousands, hundreds, tens, units) to read 4,218 without hesitation.
  • Grade 5
    Master numbers up to 9,999. The canonical decomposition prepares written calculation, rounding and unit conversion.