Number (add/sub)
Interactive practice questions
Which of the following makes $21$21?
There may be more than one correct answer.
$13+9$13+9
A
$9+12$9+12
B
$9+11$9+11
C
$10+11$10+11
D
Easy
< 1min
Which of the following makes $19$19?
There may be more than one correct answer.
Easy
< 1min
Which of the following makes $54$54?
There may be more than one correct answer.
Easy
< 1min
Which of the following makes $52$52?
There may be more than one correct answer.
Easy
< 1min
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