This Fluency Activity is a part of the Lesson 11, Unit 5, Grade K. Students make use of the pattern of 1 more in numbers 1-9, to determine 1 more with teen numbers. Knowing that 4 ones are part of 14, for example, allows them to determine that 1 more is 15, just as 1 more than 4 is 5. I want you to say one more than the number that you see on the Rekenrek.