800
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849 to 1 significant figure is 800. This is because the first non-zero digit is 8, so the significant figure is the hundreds place.
654 rounded to one significant figure becomes 700.
1534 to 1 significant figure is 2000.
10920 to 1 significant figure is 10000
2300 rounded to 1 significant figure is 2000.
470 rounded to one significant figure is 500