Answer:
1.647376
Step-by-step explanation:
Change the divisor 12.96 to a whole number by moving the decimal point 2 places to the right. Then move the decimal point in the dividend the same, 2 places to the right.
We then have the equations:
2135 ÷ 1296 = 1.647376
and therefore:
21.35 ÷ 12.96 = 1.647376
Both calculated to 6 decimal places.