ONE WAY TO THINK ABOUT IT
Use five groups and one more.
6 × 8 = 5 × 8 + 8 = 40 + 8 = 48. Separate a six-row array into five rows and one row.
Try this together
Start with a 5s fact and explain the extra group.
Say the complete fact, draw or build its groups, then try it again without the picture. It is fine to return to a known fact when an answer feels uncertain.