$6 million divided by 7 children.
$6,000,000/7 = $857,142.86
Each of her 7 children should get $857,142.86 in cash or valuables.
Each painting is worth $250,000.
$857,142.86/$250,000 = 3.4
Each child's portion is enough for 3.4 paintings, but since paintings are dealt as whole numbers, he can get 3 paintings.