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

SF, 40 connecting cubes

Task

Give the student a student form and 40 cubes. 

Say:  What number can you make in each box?  You may use your cubes to help.  Show your work with pictures, numbers, or words.

1 ten and 7 ones is ___.  Wait on student to make the number and explain the work. 

Repeat with 26 is ___ tens and 6 ones.  ___ is 8 ones and 4 tens.  5 ones and ___ tens is 35. 

Continuum of Understanding

Not Yet Proficient

Correctly represents the missing numbers in 0-1 examples

Explanations may be unclear, incorrect, or missing altogether

q  Correctly makes numbers with tens and ones only when tens are listed first

q  Correctly makes numbers with tens and ones in any order they are listed

q  Clearly explains thinking

Progressing

Correctly represents the missing numbers in 2-3 examples AND has clear explanations for those examples

OR

Correctly represents the missing number in all examples

(17, 2, 48, 3) but explanations may be unclear or incorrect

OR

Clearly explains thinking in all examples with pictures, numbers, or words, but cannot name the missing numbers correctly

Meets Expectations

Correctly represents the missing number in all examples

(17, 2, 48, 3) AND has clear explanations for those examples