Mathematics 7
Student Centre
Teacher Centre

Parent Centre
• Family Web Links
• Look At It This Way
• Surf for More Math
• Try It Out
• Web Quests

Nelson Education > School > Mathematics K-8 > Mathematics 7 > Parent Centre > Surf for More Math > Chptr 9 Lssn 4

Surf for More Math

Lesson 4 - Subtracting Fractions with Models


To encourage your child to have fun on the Web while learning about Subtracting Fractions with Models, here are some games and interactive activities they can do on their own or in pairs.


Subtract fractions less than 1 using a part of a model.

Builds Upon

Student Book pages 316-319

Instructions for Use

Fraction Bars helps your child subtract fractions within a whole using fraction bars.

A fraction bar appears when the applet opens. To use Fraction Bars, determine the size of the denominator by clicking on the up or down arrows beside the fraction bar. Click the 'fdrp' button. This button allows your child to see the sections on the fraction bar as fractions, decimals, ratios or percentage - click the 'f' for fraction display. Determine the size of the numerator by clicking on the sections inside the fraction bar - they change colour from green to yellow. Click on the bar button to make up to 5 new fractions bars. Click the 'Reset' button to start again.

Using several bars together at one time allows your child to manipulate and compare the size of the sections in the bars.


Subtracting Unlike Fractions prompts your child to subtract fractions using a model.

To use Subtracting Unlike Fractions, click the 'New Problem' button. Input the common denominator of both fractions. Find the equivalent numerators. Press 'Enter' to find the difference.