Khu$u$ Kami$ ai tunggal.
Jlh 2d + ek. nk 3kali. =================== ===================
1669=6+9=6789–>(9)k.
3698=8+8=7890–>(0)e.
6480=8+0=8901–>(1)e.
6641=5+1=6789–>(9)e.
3199=9+9=9012–>(2)e.
1622=4+2=6789–>(9)e.
5509=9+9=9012–>(0)e.
9790=9+9=9012–>???