* Write large numbers 1 through 10 on construction paper and give 10 students one number to hold in front of the class.
* Write the subtraction sentence "7 - 5" on the board.
* Ask the student who is holding the number 7 to hold it up high.
* Then ask students which direction should we go to subtract 5.
* Once students agree to count back, ask the child holding the number 6 to step forward.
* Next ask the student holding the number 5 to step forward. Continue these steps until 5 students have stepped forward.
* Write "2" to complete the subtraction sentence "7 - 5= 2."
* Tell students that today they're going to learn about counting back to find the difference.
* Read aloud the following word problem: "samer has 9 pencils. He gives 4 pencils away. How many pencils does Josh have left?"
Introduce the number line to model the word problem.
* Show how to start at the first number, 9, and count back by the second number, 4.
* Repeat the activity for 8 - 3 = 5 and 6 - 4 = 2.
* Tell students that the number you end on is the difference.
ليست هناك تعليقات:
إرسال تعليق