Math spelling

There are ______ days in a week.

After ten comes ______.

A dozen is equal to ______.

He turned (13)______ last month.

The secondary 2 boys are now (14)______ years old.

She needs to complete the 50 m lap in (15) ______ seconds to win the race.

He won the race under (16) ______ seconds.

There are (17)______ students in the class.

The voting age in many countries is (18)______.

My sister will be (19)______ next year.