Teaching estimation techniques to Year 1 students can be a lot of fun! Here are some easy ways to do it:

1. Real-life Examples: Start with fun situations, like asking how many candies are in a jar. You can encourage students to guess by rounding their answers to the nearest ten.

2. Visual Aids: Use number lines to show rounding. For example, you can explain that $23$ rounds down to $20$ and $25$ rounds up to $30$.

3. Games and Activities: Play games where students make guesses before counting things. This helps them practice and understand better.

With these methods, students will develop a good understanding of rounding and estimation!