Preview of a Level 1 math worksheet from MathCrush.com focusing on basic arithmetic estimation, featuring a central number 100 surrounded by a maze of numbers and instructions to shade even and odd problems differently.

A preview of a math worksheet titled "Answer, Find, and Shade: Basic Arithmetic Using Estimation" from MathCrush.com, Level 1. The worksheet features a central number 100 surrounded by a maze of numbers connected by lines. Students are instructed to shade even problems dark and odd problems light, or use two different colors, and circle the best estimation for each problem. The page includes various arithmetic problems with multiple-choice answers, such as 92 - 33, 54 + 45, and 39 x 7, with options like 40, 50, 60, 90, 100, 110, 280, 290, 300. A note indicates this is only a preview and images