which of the following statements is incorrect?

1 microlitre=10^-6 litres
1 megagram=10^6 grams
1 millimetre=10^3 metres
1 kilogram=10^3 grams
100 centimetres=1 metre
thanks andy

1 millimetre = 10^-3 metres (spelled meters in the USA), not 10^3 metres.

thanks so much

You're welcome, Andy! Let's go through each statement to determine which one is incorrect.

1. microlitre = 10^-6 litres
This statement is correct. To convert from microlitres to litres, you divide by 1,000,000 (10^-6). For example, 100 microlitres is equal to 0.0001 litres.

2. megagram = 10^6 grams
This statement is also correct. A megagram is equal to one million grams, so the conversion is accurate.

3. millimetre = 10^3 metres
This statement is correct. To convert from millimetres to metres, you divide by 1000 (10^3). For example, 500 millimetres is equal to 0.5 metres.

4. kilogram = 10^3 grams
This statement is correct. A kilogram is equal to one thousand grams, so the conversion is accurate.

5. 100 centimetres = 1 metre
This statement is correct. There are 100 centimetres in one metre, so the conversion is accurate.

So, all of the statements seem to be correct. None of them are incorrect.