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Numbers up to 20
Addition

Count the bricks in the pyramid

(1) Write the number in the brick

4 1 1 3 5 1 2 3 11 6 4 1 5 2 2 4
 
3 1 1 6 1 1 6 1 1 4 1 1
 
4 1 3 10 2 2 4 11 2 3 7 2
13 6 6 14 14 7 7 27 15 6 6 9 10 2 12
 
4 1 6 17 4 3 7 37 10 10 15 3