Question

Which of the following can be used to roughly measure the length of a book?

• A.
• B.
• C.
• D. All of the above

Answer 1

The correct option is D All of the above

$\text{Say:}$
$\bullet$ To measure the length of an object roughly, we can use any other available objects that are smaller than that.

$\bullet$ For example, if the length of a pencil is equal to 3 erasers, we can say the pencil is 3-erasers long.

$\bullet$ These are called nonstandard units of length.

$\bullet$ Here, all the objects given in the options are smaller than the book and can be used to measure the length of the book.

$\bullet$ Hence, option D is correct.

$\text{Probing Question:}$We can measure the length of an eraser with a water bottle right?
A: No. A water bottle is bigger than an eraser, so we cannot use a water bottle to measure the length of an eraser.