rounding up of cm

 Dear Donna,

Since every 1 cm on a ruler or a measuring tape is divided into 10 equally distant sections, we need to round up or down to get only one digit after the decimal point, so that we can measure and mark our distance down. 

24.3 cm is or equals 24 cm and 3 mm

24.1 cm to 24.9 cm can be easily measured and marked by looking at the millimeter marks on our measuring device.

If there is a second digit after the decimal point i.e. (24.25) we need to round it up or down to the closest decimal to make it easier to measure and mark.

Usually if the second decimal is 5 or more than 5 we round the number up. So 24.25 or 24.26 or 24.27 or 24.28 or 24.29 will be rounded up to 24.3 cm, but if the number was 24.24 or 24.23 or 24.22 or 24.21 we would round the number down to 24.2 cm.

I hope this makes it clear for you,

Happy sewing,

Nehzat