Hurry! An epic race is about to start! Help Lucky and Coco track their results using mental math. Along the way, you'll also use number bonds, bar models, and rounding in all sorts of addition and subtraction puzzles. Sounds fun, right? Grab your pencil, and let's go!

Want to add and subtract numbers quickly? Try mental math! Mastering this skill has lots of real-life benefits, like when you're shopping, playing games, or solving puzzles. And sometimes, you don't need answers to be exact. That's when you use rounding to help you estimate. In this workbook, join Lucky and Coco in their epic race. As they zoom past obstacles, speed-calculate using mental math and estimation. Some problems use number bonds and bar models, which are excellent tools for visualizing the puzzles. Enjoy the challenge!