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Here is a Numberjacks episode all about estimating. 

NUMBERJACKS | Best Estimate | S1E27

The Problem Blob makes things go wrong when people can't estimate - 5 to the rescue. Numberjacks: 3, 4, 5, 6 Agents: 28, 55, 70, 101 FUN FACT! WHAT is Number...

Grab a handful of a range of toys. eg lego, pens etc


Ask your child to estimate how many there are before they count and check.


Were they close?