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Rounding rules based on base 10.

Round to nearest 10's

5 ≈ 10

15 ≈ 20

51 ≈ 50

Round to nearest 100's

51 ≈ 100

78 ≈ 100

120 ≈ 100

189 ≈ 200

Round to nearest 1000's

1200 ≈ 1000

1500 ≈ 2000

1750 ≈ 2000

6782 ≈ 7000

Round to nearest 10 000's

16 082 ≈ 20 000

14 500 ≈ 10 000

15 780 ≈ 20 000

1 150 600 ≈ 1 150 000

Round to nearest 15 000's

15 680 ≈ 15 000

10 000 ≈ 15 000

25 000 ≈ 30 000

The general rule is to take number (n) and base (b) and calculate the difference (d) to base

n-b = d

and if d is more than or equal to half of base then the number is rounded up to base

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Q: How do you round to the nearest 10 000?
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