standard_description: Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
problem_activity: Task
Decide if the equations are true or false. Explain your answer.
$2+5 = 6$
$3 + 4 = 2 + 5$
$8 = 4 + 4$
$3 + 4 + 2 = 4 + 5$
$5 + 3 = 8 + 1$
$1 + 2 = 12$
$12 = 10 + 2$
$3 + 2 = 2 + 3$
$32 = 23$


aligns: no