Right, that shouldn't have been too difficult: 4·2084 is 4·21 (2 d.p.) and 4.2 (2 s.f.) 12·3456 is 12·35 and 12 608·007 is 608·01 and 610 Curious question: is the number 610 2 or 3 s.f? How can you tell? The answer isn't obvious at all: the number of significant figures in 610 is at least 2, but may be 3. It's common to take it as 3. Since we rounded up to 610, it's normal to write the answer as 610 (2 s.f.) to avoid confusion.
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