### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Use cards on the Interactive Whiteboard to form: 6 + 5 + 3 + 5 + 4 = [ ]. We can change the order to make it easier. Children discuss with a partner. Take feedback, drawing out pairs that make 10. Move cards round to show:

5 + 5 + 6 + 4 + 3 = [ ], then rewrite as:

10 + 10 + 3 = [ ], then with the answer:

10 + 10 + 3 = 23. It was easy. We just used pairs to 10 and place value! Repeat with other similar additions.**Group Activities**

-- Pick five or more 1–10 number cards to add; identify pairs to 10, doubles, and number facts to help add them.

-- Roll three or more dice and identify pairs to 10, doubles, and number facts to help add.

**Day 2 Teaching**

Write: 7 + 7, 10 + 6, 9 + 3, 6 + 4, 15 + 5, 4 + 7, 18 + 5, 20 + 7. Discuss how some can be solved using place value, putting 10s and 1s together, like 10 + 6. Some use number facts. Some use counting on. Sort into two groups: 1) counting on; 2) place value/ number facts. See important note on teaching/ activities document.**Group Activities**

Use the ‘Cross Additions’ in-depth problem-solving investigation below as today’s group activity.

Or, use this activity:

-- Sort and solve additions according to how they might best be solved (counting on, place value or number facts).

**Day 3 Teaching**

Write: 26 – 6, 30 – 7, 13 – 4, 20 – 8, 9 – 2, 14 – 4, 23 – 7. Discuss and sort into groups: those best worked out by counting back, and those most efficiently solved using place value/number facts.

**Group Activities**

-- Sort and solve subtractions according to how they might best be solved (counting back, place value or number facts).