Go through the Estimation PowerPoint as a starter.
Introduce the word estimating and what it means. Give some examples of estimating. Also discuss it means sensible guessing. Fill a jar/container with up to 30 objects such as marshmallows, buttons, lego, cars….. Children then estimate how many objects they think are in the jar and write this number down. Children then check by counting and writing the real number down. Please check for correct number formation and model correctly if you need to.
- Change the number of objects in the jar (increase and/or decrease)
- Picking up a handful of objects and estimating