Round a number to the nearest 100 (Primary school Math)

Concept: Rounding a number to the nearest 100

Technique: Rounding a number to the nearest 100

Weak numbers (0 1 2 3 4) do NOT push the digit up.  Hence, stay at 4.

Strong numbers (5 6 7 8 9) PUSH the digit UP to 6. i.e. round up