Domain

Number and Operations in Base Ten

Cluster

Understand place value.

Standard

NC.1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and ones.

• Unitize by making a ten from a collection of ten ones.

• Model the numbers from 11 to 19 as composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

• Demonstrate that the numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens, with 0 ones.

Materials

17 pencils

Task

Provide materials to the student.  Read the problem to the student: You have 17 pencils. A box holds 10 pencils.  Do you have enough pencils to fill a box?  Do you have any leftover pencils that do not fit in a box?  If so, how many pencils do you have that do not fit in a box?

Continuum of Understanding

Not Yet Proficient

Response includes 0 of the descriptors in “Meets Expectations”

Strategies Used:

q  Counts objects

q  Groups 10 objects

q  Knew without counting

Progressing

Response includes 1 of the descriptors in “Meets Expectations”

Meets Expectations

Response includes all the descriptors in “Meets Expectations”

• States that there are enough pencils to fill a box

• States that there are 7 leftover pencils that are not in a box