1. Hopscotch Number Line: Create a giant number line on the floor using masking tape, and have students practice counting and hopping along the line.

2. Number Line Race: Divide students into teams and give each team a number line. Call out addition or subtraction problems, and students have to race to the correct answer on their number line.

3. Scavenger Hunt: Hide number cards around the classroom or schoolyard and have students find them. They must then arrange the numbers in the correct order on a number line.

4. Number Line Relay: Divide students into teams and give each team a number line. Call out a number, and the first student in each team has to place a marker on that number on the line. The relay continues until all the numbers have been called out, and the team with the most markers in the correct positions wins.

5. Fill in the Gaps: Create a number line with missing numbers and have students fill in the missing numbers.

6. Target Practice: Create a target board with different numbers on it and have students throw bean bags (or other objects) at the target. Students earn points for hitting a specific number, and they can practice addition or subtraction to score higher points.

7. Number Line Art: Use a number line as a base for creating some artistic patterns or illustrations. Students can explore patterns, symmetry, and other mathematical concepts while being creative.

8. Number Line War: Divide students into pairs and give each pair a number line. Students take turns flipping over a number card and placing it on their line. The student with the higher number wins that round. The game continues until all the cards have been flipped, and the student with the most cards wins.

9. Number Line Memory: Create a set of number cards and have students lay them face down. Students take turns flipping over two cards, trying to make a match. If the numbers on the cards form a sequence on the number line, they get to keep the cards. The game continues until all the cards have been matched, and the student with the most cards wins.

10.Outdoor Number Line: Take the number line activities outside! Use chalk to create a number line on the pavement or sidewalk, and have students participate in various number line activities in an outdoor setting.

11.Number Line Puzzles: Create number line puzzles by cutting a number line into pieces. Students have to arrange the pieces in the correct order to complete the puzzle.

12. Human Number Line: Have students stand in a line and assign each student a number. Call out addition or subtraction problems, and students have to move to the correct position on the number line to solve the problem.

13. Number Line Bingo: Create bingo cards with numbers on them and call out addition or subtraction problems. Students have to find the answer on their bingo card and mark it. The first student to get a line of marked numbers wins.

14. Number Line Calculator: Use a number line as a visual representation of addition or subtraction using a calculator. Students can move along the number line to help them understand the concept of adding or subtracting.

15. Number Line Dominoes: Create dominoes with numbers on them and have students match them up by placing them in the correct order on a number line.

16. Number Line Books: Have students create their own number line books, where they illustrate different number concepts using a number line as a visual aid.

17. Number Line Patterns: Create a number line with a pattern, and have students identify the rule and continue the pattern by placing the missing numbers.

18. Number Line Story Problems: Create story problems that involve a number line, and have students solve the problems by using the number line as a tool.

These 18 number line activities will provide fun and engaging ways for students to practice counting, addition, subtraction, number patterns, and problem-solving skills in the classroom.