Crossing the decades – moving from a digit ending in 9 to the next ten – can be a difficult concept for students to master. Crossing the Decades Concentration cards help students practice this concept while playing a game. Cards include all pairs of 9 to 10 numbers up to 100 in 3 formats - digits, number names and pictures.
Select the cards that are appropriate for use with the students you are working with. Cards may be selected to include a specific number range (e.g. cards between 9 and 20) or particular sets of cards to make the task simpler or more challenging (e.g. digits and picture cards, digits and number names or number names and picture cards). Students look for the correctly sequenced numbers and find a ‘Crossing the Decades’ pair. For example: 29 and 30 or 89 and 90.
The cards can be printed in colour or black and white, and then laminated for long term use. Cut along the dotted lines to create 6 individual cards per page.