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You can also use printed out numbers and pin the 7 x 7 square on the backboard. After that,
shuffle the number cards from 1 – 50 and leave them upside down on the table.

Game (20 minutes) To start the game, one of the students draws one of the shuffled number
cards from 1 – 50 and shows it to all the other students. Now all the students have to look for a
calculation on the 7 x 7 square that results in the drawn number. The calculation must consist
of 3 numbers that are next to each other: either horizontally, vertically or diagonal. Whoever
finds a correct calculation, shouts out “Trio” and shows the calculation to the other students. In
the example below, the number 40 was drawn by the student. There are 3 examples of right
calculations.

If the answer is correct, the student obtains the number card. If the answer is not correct, the
student will be blocked until the next number is drawn.

Variations If your students are having problem finding the calculation, you can also use number
cards from 1 – 20 only and apply only addition and subtraction.

Assessment (5 minutes) The student that obtains the most number cards, wins the game. During
the game the teacher has the possibility to observe students´ basic addition, subtraction,