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.
Know counting sequences for whole numbers.
Record and interpret additive and simple multiplicative strategies, using words, diagrams, and symbols, with an understanding of equality