009999991 rounded to 2 significant digits is 1.0e7
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When rounding 1286 to 2 significant figures, you must consider the first two non-zero digits from the left. In this case, those digits are 1 and 2. The digit to the right of 2 (8) is greater than 5, so you round up. Therefore, 1286 rounded to 2 significant figures is 1300.
11225 g rounded off to 3 significant figures is 11200 g. You drop the 2 and the 5 because they are not significant in this case. It's like saying "bye Felicia" to those extra digits.
It is 6.7 when rounded to 2 significant figures
1,430 rounded to 2 significant figures is 1,400
0.6942 rounded off to 2 significant figures is 0.69