### Number Sense

We found 8 post available for you

#### Do I have enough wrapping paper?

In this problem based activity students first guess and then try to calculate whether they will have enough paper to wrap this present without taping pieces of wrapping paper together. Con...

#### How many gumballs are there?

Gumball Machine Problem from Brian Marks on Vimeo This problem is a little puzzle to get your students thinking, estimating, and calculating. We've given you a pdf file w...

#### Wrapping presents on the diagonal

﻿ Dr. Sara Santos is a popular mathematician and speaker on mathematics.  She has worked out a method for wrapping boxes (rectangular prisms) as efficiently as possible. (W...

#### That's a big tomato!

These Aussi tomatoes (the tomato on the left of all of the tomatoes) are huge.   How much do you guess one weighs? Can you figure it out?

#### Tiny vacuum with a huge reach

From the vacuum description and advertisement in the PDF, how long do you think its cord must be? Thanks to Brian Shoemaker, Newton, MA teacher, for the idea and pictures.

#### Huge diamond found in Canada

552-carat diamond found in Diavik Mine, Northwest Territories, Canada Can you tell just how big this gem is?  Do you know how big a carat is? What would this look like on a ring on you...

#### Civil rights marches, how do you count a crowd?

On October 16, 1995, perhaps a million black men gathered for the Million Man March on Washington.  This was 32 years after Martin Luther King, Jr. gave his histo...

#### McDonalds moves towards antibiotic-free chicken

Recently McDonald's announced that by 2016 they will use only chicken raised without the antibiotics that are used in human medicine.  McDonald's plans to join Chick-fil-A, Pa...