Well, honey, to round 7.8 to one decimal place, you look at the digit in the second decimal place, which is 8. Since 8 is greater than or equal to 5, you round the number up. So, 7.8 becomes a sassy 7.9.
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It is 8.8 to one decimal place
7.78
say if you have 23.4578 seconds, you make the time read to two decimal places. because 78 is nearer 100 than 0, you round the 5 up. so it becomes 23.46sec. remember. after the decimal place, 4 in tenths position, 5 in hundredths position, 7 in thousandths position etc.
.78
537 round to 530 78 round to 80 53*2 = 106 106*2 = 212 121*2 = 424 and the two 0s - one each from 530 and 80 - make it 42400. [The exact answer is 41886]