One Bar Split Into Tenths

The bar is cut into ten equal pieces, and three of them are painted orange. Each piece is one tenth, so the orange part is 0.3 of the whole bar.

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In the picture

The wooden frame around the whole bar: everything inside it counts as 1.
One cream segment: a single equal piece, worth 0.1.
The orange stretch: three pieces together, worth 0.3.

Examples

A chocolate bar snapped into ten squares: eating three of them is 0.3 of the bar.
A one-litre bottle with ten marks: water up to the third mark is 0.3 litres.

Key takeaways

Ten equal parts of one whole are tenths, and each one is written 0.1.
The digit just after the decimal point counts the tenths: 0.3 means three of them.