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It depends on the child. When I was 3 i drew a circle. My niece drew one when she was 4.
Four months
2,3,5,7,11,13, 17,19,23,29,31,37
The first twelve triangular numbers are: 1 3 6 10 15 21 28 36 45 55 66 78
The first twelve multiples of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 and 60.