Which of the following makes $21$21?
There may be more than one correct answer.
$13+9$13+9
$9+12$9+12
$9+11$9+11
$10+11$10+11
Which of the following makes $19$19?
There may be more than one correct answer.
Which of the following makes $54$54?
There may be more than one correct answer.
Which of the following makes $52$52?
There may be more than one correct answer.