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Boxes and Cartons of Pencils


Alignments to Content Standards: 2.NBT.A.1

Task

Pencils are packed 10 in a box. A classroom carton has 10 boxes.

  1. Jem has 1 carton and 4 boxes. How many pencils does Jem have all together?
  2. Lee needs to pack 370 pencils.

    1. How many boxes does Lee need?
    2. If Lee puts the boxes in cartons, how many cartons can he completely fill?

  3. Ms. Kato needs 10 pencils for each of her 26 students.

    1. If she can only buy boxes, how many boxes does she need?
    2. She finds out that it is cheaper to buy pencils in cartons. How many cartons should she buy? How many additional boxes will she need?

IM Commentary

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Solution

  1. Jem has a total of 140 pencils.
  2. To pack 370 pencils,

    1. Lee needs 37 boxes.
    2. If he puts the boxes in cartons, he can completely fill 3 cartons and will have 7 boxes left over.

  3. Ms. Kato needs 10 pencils for each of her 26 students.

    1. If she can only buy boxes, she needs 26 boxes.
    2. She can buy 2 cartons and will need 6 additional boxes. Alternatively, she can buy 3 cartons, but she will have some boxes left over.

Bill says:

about 6 years

Pencils are boring.

Cam says:

about 6 years

Bill says:

about 6 years

I take it back.

Kristin says:

about 6 years

Yeah! Plus, try to find a context appropriate for any set of second grade students anywhere in the country that is not food with a high sugar content. No, not stickers (we already have that covered elsewhere).

Bill says:

about 6 years

How about foods that are salty or fatty?

Kristin says:

about 6 years

I like those kinds of foods myself.