1=0+ 1= 1+0, so there are two simple ordered pairs 1 (0, 1, 0);

9 = 0+1=1+8 = ... = 9+0, with10;

4, there are 5;

2 has 3;

According to the principle of multiplication, the total number is 2x 10x5x3=300.

I hope it helps you!