1290
For an "estimate", I would suggest rounding it to one or two significant digits.
To find 30 percent of a number, multiply the number by 0.3. In this instance, 0.3 x 1290 = 387. Therefore, 30 percent of 1290 is equal to 387.
12.9 = 1290 %
1h = 60min 1290min x 1h/60min = 21.5h
40% of 1290= 40% * 1290= 0.4 * 1290= 516
They are no main features
2009 - 1290 = 719
1290
1290 grams = 1.29 kg
430
The century of 1271 to 1290 is the 27th century.
There are 100 centimetres in one metre. Therefore, 1290 centimetres is equal to 1290/100 = 12.9 metres.
There are 10 millimetres in one centimetre. Therefore, 1290 millimetres is equal to 1290/10 = 129 centimetres.
Dark
The Vatican really has no significant geographic features.
For an "estimate", I would suggest rounding it to one or two significant digits.