This Fluency Activity is a part of the Lesson 19, Unit 1, Grade 4. In this lesson, students are given tape diagrams or equations and are encouraged to use creativity and the mathematics learned during this module to write their own word problems to solve using place value understanding and the algorithms for addition and subtraction. Reviewing unit conversions that were learned in Grade 3 helps prepare students to solve problems with centimeters and meters in Topic A of Module 2.