1. Number Hunt: Hide numbers around your house or yard and have your children find and add them up.
2. Math Board Games: Play math-themed board games that require adding numbers together.
3. Grocery Store Math: Have your children help you add up the cost of grocery items as you shop.
4. Math Scavenger Hunt: Create a scavenger hunt with math problems that lead to a hidden treasure.
5. Baking Bonanza: Bake cookies or a cake together and practice adding the ingredients.
6. Money Matters: Teach your children about money by adding up different coin values.
7. DIY Calculator: Help your children make their own calculators using household items.
8. Shape Sum: Use blocks or building toys to create shapes and add up the number of blocks used.
9. Math Story Time: Read math-themed books that involve adding numbers or solving math problems.
10. Grocery List Addition: Ask your children to add up the quantities of items on the grocery list.
11. Math Art: Create artwork using addition problems. Each correct answer can be a different color.
12. Outdoor Math Olympics: Set up a mini Olympics with math-based activities like adding up scores.
13. Follow the Equation: Write a series of addition equations and have your children solve them by stepping on the correct answer.
14. Math Rock Band: Use musical instruments to create songs based on adding numbers.
15. Math Puzzles: Solve math puzzles that require adding numbers correctly to complete them.
16. Toy Store Math: Have your children add up the prices of toys in a pretend store.
17. Math Obstacle Course: Set up an obstacle course with math problems that need to be solved before moving forward.
18. Math Movie Night: Watch educational movies or shows that involve adding numbers and discuss them afterward.
19. Addition Relay Race: Create a relay race where teams have to solve addition problems before passing the baton.
20. Math in Nature: Go on a nature walk and add up the number of different plants or animals you see.

These 20 awesome addition activities will not only help your children improve their math skills but also make learning fun and engaging. Enjoy adding up the fun!