# Tag Archives: fraction

## Values of Integers

If and are integers such that , what are the possible values of ? (a) only (b) only (c) only multiples of (d) any integer (e) none of these Source: NCTM Mathematics Teacher, September 2006 Solution Let be an integer … Continue reading

## Red and Yellow Plums

One store sold red plums at for and yellow plums at for . A second store sold red plums at for and yellow plums at for . You bought red plums and yellow plums from each store, spending a total … Continue reading

## Biggest Pizza Slice

An 8-inch pizza is cut into equal slices. A 10-inch pizza is cut into equal slices. A 12-inch pizza is cut into equal slices. A 14-inch pizza is cut into equal slices. From which pizza would you take a slice … Continue reading

## Integral Points

A point is called integral if both and are integers. How many points on the graph of are integral points? Source: NCTM Mathematics Teacher, November 2006 SOLUTION Divide by , Divide by Divide by , no solution , duplicate solution … Continue reading

## Passing Tests

A group of boys and girls took a test. Exactly of the boys and exactly of the girls passed the test. If an equal number of boys and girls passed the test, what fraction of the entire group passed? Source: … Continue reading

## Funny Face

The radius of each small circle is of the radius of the large surrounding circle. The radius of the middle-sized circle is twice that of either small circle. What fraction of the area of the large circle is not shaded? … Continue reading

## Divide in Half

Divide in Half How many ordered pairs of integers satisfy ? Source: NCTM Mathematics Teacher 2006 SOLUTION For to be an integer must divide evenly. ordered pairs satisfy the requirement: , and . But, I don’t know how to prove … Continue reading

## Threaded Screw

A -inch screw is threaded for of its length. If the screw has threads, how far will it go into a piece of wood with each complete turn? Source: NCTM Mathematics Teacher 2008 SOLUTION Length of threaded part Depth of … Continue reading

## Pairs of Positive Integers

How many pairs of positive integers , with and both less than , satisfy the equation ? Source: NCTM Mathematics Teacher SOLUTION implies that or . Suppose Not possible because is a positive integer. We conclude that . Since is … Continue reading

## Pieces of One

Fill in each box with a digit to make three fractions whose sum is , or as close as you can get. You may use each digit only once. (The denominator of each fraction is a two-digit number, not the … Continue reading