Measuring length and time

Wei and Lucía want to know whose pencil is longer. What is the fair way to compare them?

A leaf lies along a ruler. Its stem is at 0 and its tip is at 7. How many centimetres long is the leaf?

A crayon does not start at 0. One end is at 3 and the other end is at 12. How many centimetres long is the crayon?

Amara measures the same table twice: once with paper clips and once with her hand spans. Which measurement gives the bigger number?

A pencil is really 5 paper clips long. Jomo lays clips along it, but leaves gaps between them. What happens to his count?

Gideon's game: is this statement true or false? "When I bend a string into a wiggly shape, it becomes shorter."

The rope is longer than the stick. The stick is longer than the pencil. Which statement must be true?

On a clock, the long hand points to 6, and the short hand is halfway between 9 and 10. What time is it?

It is 2 o'clock. Counting on in half hours like Margaret (2:30, 3:00, …), how many half hours is it until 4 o'clock?