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*

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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

for ordinary conversation the 1 ^-33 number is accurate enough and it neatly keeps a planck time and a planck length at the same numerical value plus or minus 10 powers

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