Subtract, Take Away, and Minus.
Have all of your students stand up again, but this time write the number of students standing. For this example let's say you have 20 students in the class. Then say, "20 minus 2 equals...?" and motion for two students to sit down. Continue this process until there are no more students standing. Then repeat the process with the words "take away", instead of "minus" to show that they are synonyms.
Write on the board:
Subtract = decreasing numbers, making smaller numbers
Minus / Take Away = (-) a math symbol that means "less"
Write 20 math equations for plus and twenty for minus. Give each student a couple of cards and have them ask their partner to answer the question by listening.
Example: Student A is holding a card that says, "6+2=___?" ( On the back it says "answer 8"). Student A says, "What does six plus two equals?" Student B Answers, "Six plus two equals eight." And then this group switches cards with another group and student B asks the question.
Also, if their is additional time, feel free to have students draw up some math art, with a (-) minus theme, that they can share with the class later.