Addition Activity – Doubles and Near Doubles

Activity 1: Adding Triangles – 10 minutes

Whole class: Write a 2 digit number on the board and ask the class for the next 2 numbers. E.g: 25, 26, 27

Arrange the numbers in a triangle and ask for suggestions of different ways to add these numbers. Write the total in the center. Highlight the near doubles strategy.

Pairs: Each player selects their own consecutive numbers and works out the total. They give their partner the total who needs to determine the 3 numbers. Exchange back and share solutions.