### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Use a place value chart of whole numbers, tenths and hundredths. Ask children to describe each row and show what happens if a digit is multiplied by 10 or 100. Suppose a digit is divided by 10? Make different numbers using the chart/place value\ additions.**Group Activities**

-- ‘Zap’ digits in numbers with 2 decimal places, using a calculator.

-- Play a game using the place value grid to reinforce the value of different digits.**Day 2 Teaching**

Write numbers in a 100s, 10s, 1s, 0.1s and 0.01s place value grid, multiply and divide by 10 and 100. Give 4 children number cards, e.g. 1, 2, 3, 4. They stand on either side of a large decimal point on the flipchart to show 12.34. They multiply their number by 10 and move accordingly. Do the class agree? Multiply by 10 again, then divide by 100. Repeat.

**Group Activities**Use the in-depth problem-solving investigation ‘Dicey Operations in Line (adapt Game 6) from NRICH as today’s group activity.

Or, use these activities:

-- Use digit cards in place value grids to multiply and divide by 10 and 100 – up to 2 decimal places.