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 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). 

CCSS.Math.Content.1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = – 3, 6 + 6 = .

CCSS.Math.MP1

Make sense of problems and persevere in solving them.

CCSS.Math.Practice.MP2

Reason abstractly and quantitatively.

CCSS.Math.Content.1.NBT.A.1

Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

Three Columns: 

Students will work in pairs to create three towers of ten using the colored cubes and the die. Students need to ensure that each tower is only 10 cubes and that any overflow of cubes in the first two towers is used towards the next tower. Student learning will be measured by their ability to create the proper sized towers using the cubes and die. 

Penny Flip: 

Students will complete a worksheet in pairs for the Penny Flip activity to find the different compliments of seven. Afterwards, they will work on a story problem that involves the compliments of seven and they will need to solve the problem in pairs. Student learning will be measured by their ability to find the different compliments of seven and solve the story problem while explaining their thinking and reasoning.