Group Activities and Games to Learn Mathematics in CBSE Class 1:

1. Number Line Hopscotch:
- Draw a number line on the ground using chalk.
- Divide the class into groups of 2-3 students.
- Each group takes turns to throw a marker or pebble onto the number line.
- The group then solves the math problem that corresponds to the number where the marker landed.
- For example, if the marker landed on the number 4, the group could solve an addition or subtraction problem like 2+2 or 6-2.

2. Shape Scavenger Hunt:
- Create a list of various shapes such as circles, squares, triangles, and rectangles.
- Divide the class into groups and give each group a copy of the shape list.
- In a designated area, ask the groups to search for objects or items that match the shapes on their list.
- Encourage the groups to discuss and identify the properties of each shape they find.
- After the scavenger hunt, have a group discussion to review the shapes and their properties.

3. Number Bingo:
- Create bingo cards with numbers from 1 to 20 randomly arranged.
- Give each student a bingo card and some counters or small objects to place on the numbers.
- One student acts as the caller and randomly calls out numbers between 1 and 20.
- Students check their cards and place a counter on the called number if they have it.
- The first student to complete a line vertically, horizontally, or diagonally shouts "Bingo!" and wins the game.

4. Counting Relay:
- Divide the class into two teams and form two lines.
- Place a basket or container at the front of each line.
- The first student in each line is given a set of objects (e.g., blocks, beans) and a number card.
- When the teacher says "Go," the students start counting the objects one by one and placing them into the basket.
- After counting, the student passes the objects and number card to the next student in line.
- The team that finishes counting and placing objects in the basket first wins the relay.

5. Math Storytelling:
- Divide the class into small groups.
- Provide each group with a set of number cards or manipulatives.
- Ask each group to create a math story using the numbers and manipulatives.
- Encourage the groups to incorporate addition, subtraction, or other math concepts into their stories.
- After preparing their stories, the groups can take turns sharing their math story with the rest of the class.

6. Measurement Olympics:
- Set up various stations around the classroom or playground with different measurement activities.
- Divide the class into groups and assign each group to a station.
- Each station can have activities like measuring the length of objects, weighing items, or comparing volumes.
- Provide measuring tools such as rulers, scales, and measuring cups.
- The groups rotate through the stations, completing the measurement tasks and recording their answers.
- At the end, gather the class to discuss the results and compare the measurements taken at each station.

These group activities and games not only make learning mathematics enjoyable but also promote teamwork and problem-solving skills among the students.