Teaching and Group Activities for Understanding
Day 1 Teaching
Display 26 and model how to draw a jotting to partition:
40 + 12 = 52
Demonstrate how the same jotting will help us partition a number to halve it. Repeat with other numbers.
Use the ‘Doubling Forever’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Find double and half of odd and even 2-digit numbers.
Day 2 Teaching
Write 226 and draw a partitioning jotting to show children how to double this number. The same process can be modelled for halving. Demonstrate how the jotting is crucial (we use it to partition the numbers).
Use doubling to check halving answers.
Double and halve 3-digit numbers.