Help section: 15 comes exactly halfway between 10 and 20. 25 is exactly halfway between 20 and 30.

Numbers with 5, 6, 7, 8 or 9 in the units place round up. Numbers with 1, 2, 3 or 4 in the units place round down.

So: 15 rounds up to 20 and 25 rounds up to 30.

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15 comes exactly halfway between 10 and 20. 25 is exactly halfway between 20 and 30.

Numbers with 5, 6, 7, 8 or 9 in the units place round up. Numbers with 1, 2, 3 or 4 in the units place round down.

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