### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Discuss how we mark 2-digit numbers on a line 0–100. Then mark 275 on a line 200–300. Discuss halfway, and where 275 goes. Repeat, marking numbers on a 400–500 line.

**Group Activities**

-- Create a game placing hidden 3-digit numbers between hundreds on a landmarked line.

-- Mark 3-digit numbers on landmarked lines.

**Day 2 Teaching**

Review the top tips written yesterday. Model how to think about half and quarter to help place 3-digit numbers on a 0–1000 line.**Group Activities**

-- Place 3-digit numbers on 0–1000 landmarked lines.

-- Make and use a 0–1000 number line.

-- Play a game to find mystery numbers string ‘number line’.

**Day 3 Teaching**

Play the Nasty Game. Show a place value grid (100s, 10s and 1s). Write different numbers on the grid, discussing their place value.

**Group Activities**

-- Play the ‘Nasty Game’ to make and compare 3-digit numbers.

**Day 4 Teaching**

Compare and order numbers using the place value grid. Discuss which digit to look at when the hundreds digit is the same. Find 3-digit numbers which fall between two given 3-digit numbers.

**Group Activities**

-- Order numbers using number lines and place value.

-- Find numbers between pairs of 3-digit numbers.

-- Ask questions to determine a mystery 3-digit number.

**Day 5 Teaching**

Challenge children to write the largest 3-digit number using digits 0–9 only once each. Repeat for other target numbers.**Group activities**

Use the in-depth problem-solving investigation ‘Counter Place Value’ as today’s group activity.

Or, use this activity.

-- Investigate making 3-digit numbers with given criteria.