Standards covered:

• 1.3 Number and operations
• 1.3A
  

  Use concrete and pictorial models to determine the sum of a multiple of 10 and a one-digit number in problems up to 99.

• 1.3D
  

  Apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10.

• 1.3E
  

  Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences.

• 1.3F
  

  Generate and solve problem situations when given a number sentence involving addition or subtraction of numbers within 20.

• 1.5 Algebraic reasoning
• 1.5D
  

  Represent word problems involving addition and subtraction of whole numbers up to 20 using concrete and pictorial models and number sentences.

• 1.5G
  

  Apply properties of operations to add and subtract two or three numbers.