### Planning and Activities

**Day 1**Model using Frog to find change from £5, £10 and £20 when buying one or several items.

**Group Activities: T with Y3**

Y3 -- Practise finding change from £5, £10 and £20.

-- Choose two items that add up to under £5, £10 or £20, then calculate change.

Y4 -- Buy multiple items that add up to under £20, then calculate change.

-- Choose two items that add up to under £5, £10 or £20, then calculate change.

**Day 2**Model using Frog to find change from £100 when buying several items. Represent problems with a bar model.

**Group Activities: T with Y4**

Y3

*Use the in-depth problem-solving investigation ‘Step Change’ as today’s group activity.*

Or, use these activities:

-- Practise finding change from £100 for a range of items.

-- Play ‘Change from £100 pairs’.

Y4 -- Practise finding change from £100 when buying 2 or 3 items.

**Day 3**Model finding differences using Frog, e.g. a game costs £18, if I have £7.55 how much more will I need to save?

**Further Teaching with Y4**

Use Frog to calculate differences between two amounts: £28.84 and £32.37; £23.24 and £18.78.

**Group Activities: T with Y3**

Y3 -- Calculate how much more money is needed to pay for a range of items.

-- Calculate how much more money is needed to pay for a more expensive version of an item.

Y4 -- Find the difference between two amounts of money.

**Day 4**Explore a range of 3-digit subtractions to discuss the choice of most appropriate/efficient strategies.

**Further Teaching with Y4**

Reasoning about when to use mental or written subtraction in a range of examples.

**Group Activities: T with Y4**

Y3 -- Subtract two 3-digit numbers, beginning to recognise when to use each of two different mental strategies.

-- Find the mystery missing numbers that have been subtracted from 3-digit numbers.

Y4 -- Justify choices for, then use, mental or written strategies for subtraction.

-- Sort calculations according to whether they are more efficiently solved mentally or using a written method.

**Day 5**Discuss several word problems.

*Would you use addition or subtraction calculations?*Discuss how a sketch, number line or bar model can support visualisation before answering.

**Group Activities: T with Y3**

Y4

*Use the in-depth problem-solving investigation ‘Prime Addition Squares’ as today’s group activity.*

Or, use these activities:

Y3/Y4 -- Solve single-step word problems in a group, then in pairs.

-- Fill the gaps with missing numbers in multi-step number stories.