### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Show an enlarged 0–20p number line. Mark 20p and stick 12 pennies with sticky tack under it. How many more pennies do I have to find to make 20p? Use number bonds to 10 (2 + 8) to work this out. Relate this to bonds to 20. Repeat for 15p + 5p = 20p.**Group Activities**

-- Pick a money card and find the complement to 20p.

-- Listen to coins dropping into a tin; work out the complement to 20p.

**Day 2 Teaching**

Show pictures of differently priced toys. Children work in pairs to pick two and add the prices. Discuss which number facts they need to use. Rehearse adding pairs of toys using facts, e.g. doubles or bonds to 10 or 20: 6p + 6p and 14p + 6p.

**Group Activities**Use the in-depth problem-solving investigation ‘Dicey coins’ as today’s group activity.

Or, use this activity:

-- Pretend-shopping: add two or three amounts, identifying helpful number facts where possible.

**Day 3 Teaching**

Display a 0–£1 penny line (see resources). What is 60p add 10p? Do we need to count on in ones? (No) Draw a jump labelled + 10p from 60p to 70p. Relate this to ‘Spider counting’ on the 100-square. Point to 70p and repeat. Write 70p + 10p = 80p. Continue like this, adding 10p and 20p to different amounts, e.g. 42p, 71p, 13p. Use the money line to show children that 100p = £1.

**Group Activities**

-- Calculate price increases of 10p or 20p using penny lines.

-- Calculate price increases of 10p, 20p or 30p using penny lines.