Round decimals up to thousandths. Should also include some whole number rounding so students can see itâ€™s all part of the same idea. Special attention should be given to rounding up 9s. Here's a good video on that.

Watch these Khan Academy videos:

Do these Khan Academy exercises:

Next, give your students these challenges:

- 2018 Math Kangaroo Levels 3-4 Problem #23 by STEM4all
- Thirsty? by NRICH

Conclude by leading this investigation:

Round-off Dragon by MathPickle

5.NBT.A.4: Use place value understanding to round decimals to any place.