### Teaching and Group Activities for Understanding

**Day 1 Teaching**Use a washing line of numbers to 20 to model starting anywhere and counting on to add 1 or 2. Match this to a tower of cubes, e.g. 13 cubes, add 2 more and record: 13 + 2 =.

**Group activities**

-- Adding 1 and subtracting 1 from number cards and recording number sentences.

-- Finding 1 more and 1 less and demonstrating this on a number track.

**Day 2 Teaching**Use a large beaded line to 20 and model how we can find 2 more/less than any number up to 20. Record the hops on the beaded line and have children do the same.

**Group activities**

-- Work out addition and subtraction number sentences by drawing hops on a beaded line.

**Day 3 Teaching**Use a large 0–20 beaded line. Point at a number, e.g. 5. Demonstrate how to add 3. Make a matching tower of cubes. Model adding 3 more cubes, one at a time. Record 5 + 3 = 8. Repeat.

**Group activities**

Use the 'Red or Blue’ in-depth problem-solving investigation below as today’s group activity.

Or, use these activities:

**-- Add small numbers by counting on using a bead string.**

-- Add 2 sets of numbers together using a beaded line.

**Day 4 Teaching**Show a coat hanger with 2 pegs at 1 end and 7 pegs at the other. Point to the 2, and add the 7. Count on saying 3, 4, 5, … 9. That was a lot to count on! Turn the hanger round to show 7 and 2. Are there still the same number of pegs? Model how we hold the hanger either way round to make the adding easier, i.e. counting on the smaller number.

**Group activities**

-- Discuss and decide whether to stick or switch the addition number sentence.