# Online Math Operation Games: K-4

**Smarty Math Games** – Fourteen different free online math games that will give students practice on basic single-digit and double-digit math problems. Addition, Subtraction, Multiplication, and Division.

Understand addition, and understand subtraction.

*CCSS.Math.Content.K.OA.A.5*

* Fluently add and subtract within 5.*

** Add and subtract within 20.**

* CCSS.Math.Content.1.OA.C.5*

* Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).*

* 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).*

** Add and subtract within 20.**

* CCSS.Math.Content.2.OA.B.2*

* Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.*

* Use place value understanding and properties of operations to add and subtract.*

* CCSS.Math.Content.2.NBT.B.5*

* Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.*

* CCSS.Math.Content.2.NBT.B.6*

* Add up to four two-digit numbers using strategies based on place value and properties of operations.*

** Multiply and divide within 100.**

* CCSS.Math.Content.3.OA.C.7*

* Fluently multiply and divide within 100, using strategies such as the relationship between multiplication and division (e.g., knowing that 8 × 5 = 40, one knows 40 ÷ 5 = 8) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers.*

** Use place value understanding and properties of operations to perform multi-digit arithmetic.**

* CCSS.Math.Content.4.NBT.B.4*

* Fluently add and subtract multi-digit whole numbers using the standard algorithm.*