### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Revise placing 2-digit numbers on a 0–100 landmarked line. Understand place value in 2-digit numbers and use this to place numbers on the line.

**Group Activities**Use the in-depth problem-solving investigation ‘Reasoned Rounding’ from NRICH as today’s group activity.

Or, use these activities:

-- Mark 2-digit numbers on 0–100 lines.

-- Mark 2-digit numbers on lines and create inequality sentences. Also write numbers in between.

**Day 2 Teaching**

Use number lines 0–100, then 100–200 and then 0–1000.

Show on a beaded bar and use this to count by 10s. Children place given numbers on their own landmarked lines.**Group Activities**

-- Mark 3-digit numbers on lines with accuracy. Compare.

-- Mark numbers on 0–100 grids and landmarked lines and check each other’s work.

**Day 3 Teaching**

Children use place value cards (or arrow cards) to create 3-digit numbers. Compare the numbers. Then write the numbers on a place value grid and use this to compare them. Which number has the most hundreds? The most tens? Children then order three 3-digit numbers.**Group Activities**

-- Make greatest and least possible 3-digit numbers from 3 digits.

-- Whole class investigation looking at combinations of numbers possible using three digits.