Math Grade 1 Quiz Add and subtract within 20, demonstrating fluency for addition and subtraction within 10 – 1.OA.C.6

In this Common Core State Standards topic, students are expected to master addition and subtraction within 20. By the end of their learning, they should be fluent
in performing addition and subtraction within 10. To achieve this, various strategies are recommended: Counting on: This involves starting at one number and then counting forward or
backward by another number. For instance, to add 3 + 4, one would start at 3 and count on four more numbers: 4, 5, 6, and 7. Making ten: This strategy is about decomposing numbers in a way that makes a
ten. Using the given example, 8 + 6 can be thought of as 8 + 2 + 4, which translates to 10 + 4 = 14. Decomposing a number leading to a ten: This strategy breaks down numbers to simplify the subtraction operation. For example, 13 – 4 can be thought of as 13 – 3 – 1, which results in 10 – 1 = 9. Using the relationship between addition and subtraction: If students know the result of an addition operation, they can use it to find the result of the corresponding subtraction operation. For instance, if they know that 8 + 4 = 12, then they can quickly determine that 12 – 8 = 4. Creating equivalent but easier or known sums: This involves transforming a problem into a simpler problem that has a known answer. An example is adding 6 + 7, where it can be turned into 6 + 6 + 1 to get 12 + 1 = 13.