4th/5th Grade Math Advice Needed

I agreed to help a friend's 4th grader with math.
She is doing okay, her parents want to be in the advanced program.

Met with her teacher - he thinks she is where she should be.

Working on angles and number patterns now.
Any advice or interesting exercises?

I taught college for eight years and 20 years of teaching engineers and network folks - very different audience.

Thanks in Advance,
Dale