Explain to students what the worksheet requires them to do.

Say: You will need to read the text Vikings and then fill in the spaces on this worksheet. It may be easier to read a chapter and fill in the area relating to that chapter as you go.  

Hand out the books and have students read quietly at their own pace. They should fill in their worksheets as they read. This will help them to focus on the information presented in the text, giving them goals in their reading and increasing comprehension.