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Numbers up to 20
Addition

Count the bricks in the pyramid

(1) Write the number in the brick

4 2 2 5 6 4 1 5 14 7 2 5 2 2 1 3
 
5 2 2 4 2 2 4 2 1 6 2 1
 
1 3 1 10 2 2 4 11 1 2 9 1
12 9 9 11 13 3 5 21 10 4 7 3 10 6 16
 
3 5 4 22 2 6 8 24 3 10 32 9