**Instructions for Pupils**

Watch the lesson video on how to solve this math challenge. 1. Tap . Figure out the value of each character. 2. Tap or to write the value of each character in the box. *Remember, your answers are correct only if they make sense with all of the math sentences. It's a challenge, so it may require some hard thinking. 3. Tap when you are done.

1st Grade Standards: CCSS.MATH.CONTENT.1.OA.D.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. CCSS.MATH.CONTENT.1.OA.A.2 Solve (word) problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.MATH.PRACTICE.MP1 Make sense of problems and persevere in solving them. CCSS.MATH.PRACTICE.MP2 Reason abstractly and quantitatively.