Count on and count back - math grade 2 - lesson 32 - ماث فور يو

In today’s lesson, we apply mental math strategies to add and subtract problems involving a 2-digit number and a 1-digit number. we play a game to reinforce these skills where we create numbers and add or subtract to solve the problem.

Math4u grade 2 first term

ماث فور يو جريد 2

math grade 2 first term

شرح دروس ماث جريد 2 الترم الاول المنهج الجديد بأسلوب سهل وبسيط

Mathematics Teacher`s Guide primary 2

$Count on and count back - math grade 2 - lesson 32$

Math primary 2 first term lesson 32

Learn (40 minutes)

Directions

1.TEACHER SAY: Today we are going to play a game that will help us review some of the things that we have been learning. You will play in groups, but first I will teach you how to play the game. Open your student book to page Lesson 32: Apply.

STUDENTS DO: Open student book to page Lesson 32: Apply.

TEACHER DO: Display die and number cards 1 to 9.

TEACHER SAY: I have a die with numbers 1 to 6 on it and a set of number cards 1 to 9. We will use these math tools to create numbers to add and subtract.

TEACHER DO: Draw the problem on the board as it is shown in the student book.

TEACHER SAY: First, I will roll the die. Th at number will go in the first box.

TEACHER DO: Roll the die and share the number with the students. Write the number rolled in the first box. Have students write the number in the first box in the student book.

STUDENTS DO: Write the number in the first box in the student book.

TEACHER SAY: I roll the die again. That number will go in the second box.

TEACHER DO: Roll the die and s/hare the number with the students. Write the number rolled in the second box. Have students write the number in the second box in the student book.

STUDENTS DO: Write the number in the second box in the student book.

TEACHER SAY: Now we have our first addend, _____. To find the next addend, I will draw a card from the stack.

TEACHER DO: Draw a number from the stack and write it in the third box.

TEACHER SAY: Now we have our addition problem. Let’s solve it together using a mental math strategy. Let’s use the strategy Counting On to find the sum of _____ + _____ . We will start with the larger number and count on. Count with me.

STUDENTS DO: Count on aloud with the teacher.

TEACHER DO: Record the sum on the board. Have students record the sum in the student book.

STUDENTS DO: Record the answer in the student book.

TEACHER SAY: Let’s read the full problem together: _____ + _____ = _____.

STUDENTS DO: Read aloud the completed problem.

2.TEACHER DO: Help students Count Off to form groups of 5.

TEACHER SAY: Move with your group to a place you can play the game together. Take turns rolling and picking number cards. Be sure everyone in your group writes the problems in the student book. Solve as many problems as you can in the next 5 minutes.

STUDENTS DO: Move to work together. Work in groups to create and solve the addition problems.

TEACHER DO: Walk around the room and assist as needed. After about 5 minutes, have students return to their seats.

3.TEACHER SAY: You have done a great job with addition. Now let's try some subtraction problems. We will follow the same process, but this time, we will subtract the numbers. Let’s practice one together.

TEACHER DO: Model how to roll the die to get the first two digits, then pick a card to get the third digit. Write all of the numbers on the board as you go. Have students copy the numbers into the student book.

TEACHER SAY: Let’s use a different mental math strategy to subtract. We will use Counting Back to find the difference.

TEACHER DO: Model how to use Counting Back to solve the subtraction problem. Record the answer on the board. Have students write the answer in the student book. Answer questions if needed.

STUDENTS DO: Write the answer in the student book.

TEACHER SAY: Move with your group back to where you were playing the game. Take turns rolling and picking number cards. Be sure everyone in your group writes the problems in your student books. Solve as many problems as you can in the next 5 minutes.

STUDENTS DO: Move to work together. Work in groups to create and solve the subtraction problems.