### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Children make 24 and 32 using place value cards. Model this process using Place value ITP. Demonstrate how to add the two 10s and the two 1s and then recombine: 30 + 20 = 50 and 2 + 4 = 6. Total = 56. Also show how to count on in 10s and 1s (start at 32; add 20 then 4): 32..42..52..53..54..55..56. Which strategy do you prefer? Ask children to work out 73 + 21, 52 + 37, 54 + 26. Model 47 + 35 using partitioning, to show what happens when the ones add to more than ten.**Group Activities**-- Add two 2-digit numbers from number cards, noting methods used.

-- Add two 2-digit numbers from dice, explaining reasons for methods used.

**Day 2 Teaching**

Remind children of the two methods they used in Day 1 for adding: partitioning and counting on. Practise adding two 2-digit numbers, allowing children to choose their preferred method. Ask two children using different methods to explain why they used the method they chose.**Group Activities**Use the in-depth problem-solving investigation ‘Diagonal hundreds’ as today’s group activity.

Or, use these activities:

-- Add two 2-digit numbers from spinners, choosing appropriate methods.

-- Add two 2-digit numbers, suggesting the method to be used and devising ‘top tips’ for method selection.