It is 109.
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1,091 = (1 x 1000) + (0 x 100) + (9 x 10) + (1 x 1)
1091/100 = 10.91 The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1". As the required answer is a whole number then the first figure to be discarded is 9. As this is 5 or more, then the previous figure (0) is increased by 1. 10.91 when rounded to the nearest whole number is 11.
It is 29.1 rounded to the nearest 1/10 or 29.12 rounded to the nearest 1/100
1.45 rounded to the nearest whole number is 1.0.
1 rounded to the nearest ten is zero.