Start 62 Inter. Your students will discover that measuring length in centimeters is no different than using thumb widths or paper clips. Centimeters are just easier to use, everywhere the same, and conveniently converted, by multiples of 10, into other metric forms.
Every lesson is high interest and hands-on.
Your students will estimate the height of tall buildings and reinvent the measuring wheel. Vernier calipers that are 100 times more accurate.