Math Concepts & Skills > Subtraction

Cavity-Less Caper
Students decide how much money will be spent on dental floss in a lifetime.

Fences for Grazing
Given 100 feet of fencing, students determine the greatest area possible and the number of posts needed.

Handshake Problem
Students determine the total number of handshakes that would take place among a group of people shaking each other's hands.

LA to NY
Students determine how much their trip from LA to NY will cost.

Locker Dilemma
Students determine which lockers will be open, and which closed, after other students have open and closed them.

Meeting Dilemma
Students try to determine when their teachers can find time to meet.

Nine Fish
Students determine how to put nine fish into two tanks.

Phone Chain
Students determine the most efficient phone chain.

Poker Game
Students identify the amount of time it takes to exhaust the possible seating arrangements for a poker game.

Population in 2020
Students estimate the population of the United States in the year 2020.

Staircase Dilemma
Students predict the number of blocks required to build a staircase and to find a pattern.

Sums Dilemma
Students determine the most likely sums when dice are tossed.

Tan Pattern Block Angles
Students determine the value of the angles of the tan pattern block piece.

The Twelve Days of Christmas
Students use the Twelve Days of Christmas song to determine the number of gifts received and to project the number and range of gifts.

Variable Dilemma
Students solve a series of letter equations by substituting numbers.

Wrapping Mom's Lamp
Students identify the smallest sheet of wrapping paper needed to wrap a lamp.

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