This resource will turn your students into number line detectives. Students will be able to understand a number line and practice using a number line through addition and subtraction. The fun theme of detectives, bugs and frogs will keep students interested and engaged in the worksheet. There are 57 worksheets in this resource. They require NO PREP. This resource is a PD and NOT EDITABLE. Number lines are a wonderful resource to help students understand and solve addition and subtraction problem