### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Practise rounding to the nearest 100. Then round to the nearest 1000 and the nearest 100 to approximate totals of pairs of 4-digit numbers. Use column addition to find the exact totals, revising leaving an empty row for extra 10s, 100s etc.

**Further Teaching with Y6**

Use the same method to add pairs of 5-digit numbers (answer less than 100,000).

**Group Activities**

Y5 -- Use column addition to add pairs of 4-digit numbers, recognising that some calculations produce an extra 10, 100, or 1000. Some children will add pairs of 5-digit numbers.

Y6 – Create pairs of 5-digit numbers; use column addition to add them. Some children will aim for a target range for the total.

**Day 2 Teaching**

Using a table of hits on a website, find totals, modelling how to use column addition of 5-digit numbers (answers less than 100,000, then greater than 100,000).**Group Activities**

Use the in-depth problem-solving investigation ‘Giant domino addition’ as today’s group activity.

Or, use these activities:

Y5 -- Use column addition to add pairs of 5-digit numbers. Some children will aim for a target range for the total of two 4-digit numbers.

Y6 -- Create pairs of 5-digit numbers with totals between 50,000 and 100,000 or totals close to 100,000 or 150,000, using given digits.