**Student Instructions**

Click . Then click the link to watch the on page one. Next, use the to to count back to subtract on the number line. Then, write the remainder in the box. Use the to your voice explaining how to count back to subtract on page 7. Click the when you are done.

This activity aligns with 1st grade math standards including: Represent and solve problems involving addition and subtraction. CCSS.Math.Content.1.OA.A.1 Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.Math.Content.1.OA.C.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows You can find more math videos here: https://www.youtube.com/playlist?list=PLZ-dFewIqnkzA2fD9orT3n4yCUl-a56cW