a planck length is the distance travelled moving at the speed of light for one planck time and works out at 10 million million million million million million millionths of a kilometre or... 1 ^ -33 centimetres*
the speed of light is very nearly 300000 kilometres each second
300000 km per second divided by ten = 30000 kilometre in a tenth of a second
30000 km divided by ten = 3000 km in 100th of a second
3000 km divided by ten = 300 km in 1000th of a second
300 km divided by ten = 30 km in 10 000th of a second
30 km divided by ten = 3 km in 100 000th of a second
3 km divided by ten = 300 metres in 1 000 000th of a second
300 metres divided by ten = 30 metres in 10 000 000th of a second
30 metres divided by ten = 3 metres in 100 000 000th of a second
3 metres divided by ten = 300 centimetres in 1 000 000 000th of a second
300 centimetres divided by ten = 30 centimetres in 10 000 000 000th of a second
30 cm divided by ten = 3 cm in 100 000 000 000th of a second
3 cm divided by ten = 0.3 of a cm in 1 000 000 000 000th of a second
0.3 cm divided by ten = 0.03 of a cm in 10 000 000 000 0000th of a second
0.03 cm divided by ten = 0.003 of a cm in 100 000 000 000 000th of a second
0.003 cm divided by ten = 0.0003 of a cm in 1 000 000 000 000 000th of a second
0.0003 cm divided by ten = 0.00003 of a cm in 10 000 000 000 000 000th of a second
0.00003 cm divided by ten = 0.000003 of a cm in 100 000 000 000 000 000th of a second
0.000003 cm divided by ten = 0.0000003 of a cm in 1 000 000 000 000 000 000th of a second
0.0000003 cm divided by ten = 0.00000003 of a cm in 10 000 000 000 000 000 000th of a second
0.00000003 cm divided by ten = 0.000000003 of a cm in 100 000 000 000 000 000 000th of a second
0.000000003 cm divided by ten = 0.0000000003 of a cm in 1 000 000 000 000 000 000 000th of a second
0.0000000003 cm divided by ten = 0.00000000003 of a cm in 10 000 000 000 000 000 000 000th of a second
0.00000000003 cm divided by ten = 0.00000000003 of a cm in 100 000 000 000 000 000 000 000th of a second
0.000000000003 cm divided by ten = 0.000000000003 of a cm in 1 000 000 000 000 000 000 000 000th of a second
0.0000000000003 cm divided by ten = 0.0000000000003 of a cm in 10 000 000 000 000 000 000 000 000th of a second
0.00000000000003 cm divided by ten = 0.00000000000003 of a cm in 100 000 000 000 000 000 000 000 000th of a second
0.000000000000003 cm divided by ten = 0.000000000000003 of a cm in 1 000 000 000 000 000 000 000 000 000th of a second
0.0000000000000003 cm divided by ten = 0.0000000000000003 of a cm in 10 000 000 000 000 000 000 000 000 000th of a second
0.00000000000000003 cm divided by ten = 0.00000000000000003 of a cm in 100 000 000 000 000 000 000 000 000 000th of a second
0.000000000000000003 cm divided by ten = 0.000000000000000003 of a cm in 1 000 000 000 000 000 000 000 000 000 000th of a second
0.0000000000000000003 cm divided by ten = 0.0000000000000000003 of a cm in 10 000 000 000 000 000 000 000 000 000 000th of a second
0.00000000000000000003 cm divided by ten = 0.00000000000000000003 of a cm in 100 000 000 000 000 000 000 000 000 000 000th of a second
0.000000000000000000003 cm divided by ten = 0.000000000000000000003 of a cm in 1 000 000 000 000 000 000 000 000 000 000 000th of a second
0.0000000000000000000003 cm divided by ten = 0.0000000000000000000003 of a cm in 10 000 000 000 000 000 000 000 000 000 000 000th of a second
0.00000000000000000000003 cm divided by ten = 0.00000000000000000000003 of a cm in 100 000 000 000 000 000 000 000 000 000 000 000th of a second
0.000000000000000000000003 cm divided by ten = 0.000000000000000000000003 of a cm in 1 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.0000000000000000000000003 cm divided by ten = 0.0000000000000000000000003 of a cm in 10 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.00000000000000000000000003 cm divided by ten = 0.00000000000000000000000003 of a cm in 100 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.000000000000000000000000003 cm divided by ten = 0.000000000000000000000000003 of a cm in 1 000 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.0000000000000000000000000003 cm divided by ten = 0.0000000000000000000000000003 of a cm in 10 000 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.00000000000000000000000000003 cm divided by ten = 0.00000000000000000000000000003 of a cm in 100 000 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.000000000000000000000000000003 cm divided by ten = 0.000000000000000000000000000003 of a cm in 1 000 000 000 000 000 000 000 000 000 000 000 000 000 000th of a second
0.0000000000000000000000000000003 cm divided by ten = 0.0000000000000000000000000000003 of a cm in 10 000 000 000 000 000 000 000 000 000 000 000 000 000 000th of a second
*to be precise the speed of light is 299 792 458 metres a second which makes the 1 -33 of a centimetre number at the top of the page bigger than it actually is
if you want to be absolutely accurate divide the 299 792 458 number by ten 43 times