### Planning and Activities

**Day 1 Teaching**

Remind children how to use expanded addition to calculate 728 + 153, leaving a line above the answer for the extra tens, then modelling 567 + 158 showing how we need to add an extra 10 and 100. Repeat for trios of numbers, first estimating the totals.

**Group Activities: T with Y3**

Y3 -- Use expanded addition to add two 3-digit numbers. Some children will begin to use compact addition.

Y4 -- Apply compact addition skills to add trios (or pairs) of 3-digit numbers, aiming for given target totals.

**Day 2 Teaching**

Use both expanded and compact column addition to calculate the same addition. Children try each method, then say which they prefer.

**Further Teaching with Y4**

Remind children how to use expanded addition to add £3.24 and £2.58, then model compact addition.

**Group Activities: T with Y4**

Use the ‘Next door additions’ in-depth problem-solving investigation below as today’s group activity.

Or, use these activities:

Y3 -- Target totals: make additions with a total less than 500 and more than 500. Some children will use expanded addition; others will use compact addition. They then choose their preferred layout to calculate other additions.

Y4 -- Add pairs of amounts of money using expanded and then compact addition.

**Day 3 Teaching**

Use IWB £1, 10p and 1p coins to show addition of pennies, then 10p coins to amounts on a place value grid, crossing multiples of 10p and £1. Show how to use expanded and compact addition to add amounts of money (1p coins >10p, 10p coins >£1).**Group Activities: T with Y3**

Y3 -- Add multiples of 1p and 10p to given prices.

Y4 -- Use expanded addition and compact addition to add amounts of money. Some children will rank calculations in order of difficulty; explain reasoning.

**Day 4 Teaching**

Use IWB £1, 10p and 1p coins to show addition of 10p, 20p and 4p to prices.

**Further Teaching with Y4**

Show how to use compact addition to add two prices.**Group Activities: T with Y4**

Y3 -- Use place value grids to help add multiples of 10p to given prices. Some children will count on in tens to add multiples of 10p.

Y4 -- Apply compact addition skills to add pairs/trios of 3-digit amounts of money.