Maths Yr 2 - Roundup / Pembundaran

There's a lot of method trying to teach lower primary children with rounding up numbers. 
The basic that I went thru with Aimar was:

1. Pastikan faham tentang digit dan nilai rumah setiap digit i.e. rumah ratus, puluh, & sa
2. Belajar untuk mencerakinkan nombor i.e. 678 = 600+70+8

To complete the round up, it's all about plus one or not to plus anything.