The width of a math book is about 1.5 what?

decimetre

The width of a math book is generally15cm, and15cm is 1.5 decimeter.

Decimeter is a unit of length in the international system of units, with the symbol dm. A decimeter is equal to ten centimeters, which is also equivalent to one tenth of 1 meter.

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The same is true of second-grade mathematics.

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