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1) What two hundreds does it lie between?
2) Which hundred is it closest to? Would be round up or down?
To answer the second question, I have encouraged the children to look at the tens column. If it is less than 50 round down, or 50 or above, round up.
It is also good to draw it out and make a blank number line, so it is very visual for them.
If they do this, they should find the number that lies half way between them and mark it on the number line. They may also want to mark on the tens. Then they can clearly see whether it is above or below and so know which way to round.
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