1ST GRADE TENS AND ONES FLIP BOOK PROJECT iREADY ® Math Unit 4 Lesson 15 FLIP BOOK FUN ACTIVITY CRAFT This Flip Book Project is a great companion for iReady® Math.This project is a great addition to any Math Curriculum for First Grade. It offers your students extensive practice with practicing how to: Understand that the equal sign connects two quantities with the same value.Determine if equations are true or false.Find the unknown number in any position in an addition or subtraction equation.