Question

Ashleigh has to add 3,87 + 1,16 and leave her answer correct to two significant digits.Her work is shown below:3,87 is rounded off to 3,9 and 1,16 is rounded off to 1,23,9 + 1,2= 5,1Explain why her work is incorrect

Answer 1

Her work is incorrect because she has to round to two significant figures after she adds the numbers instead of rounding each individual one and then adding.