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Nelson Education > School > Mathematics K-8 > Math Focus > Grade 7 > Parent Centre > Surf for More Math > Chapter 2 - Lesson 4
 

Surf For More Math

CHAPTER 2: FRACTIONS

Lesson 4: Subtracting Fractions with Fraction Strips

Use these interactive activities to encourage your child to have fun on the Web while learning about fractions. Your child can try these activities on their own or in pairs.

Goal

Subtract fractions less than 1 using fraction strips.

Builds Upon

Student Book pages 56–60

Instructions for Use

Subtract Fractions lets your child practise subtracting fractions and mixed numbers using fraction strips.

To use Subtract Fractions, scroll down to read the instructions and then scroll up and click on “Start” to see the minuend. Type the fraction in the “Whole”, “Numerator”, and “Denominator” boxes at upper right and click “OK”. If correct, a subtrahend is displayed below and the fraction for the minuend appears. Type the subtrahend fraction in the 3 upper right boxes and click “OK” to see it appear below to the right of the first, followed by an “=” sign. Now type the difference in the 3 upper right boxes and click “OK”. If right, “Difference is correct!” is displayed. Incorrect values at any stage will bring up an error message prompting you to re-enter the correct values. To begin a new game, click on “New Example”. To see the correct way to subtract the fractions, click on “Explain”. To view your score and print a report card, click on “Report”.

Subtract Unlike Fractions allows your child to subtract unlike fractions by first changing them into equivalent fractions.

To use Subtract Unlike Fractions, read the instructions and click on “New Problem”. Type in the common denominator in the box provided and press “Enter”. If correct, chimes sound and a numerator box displays. Type in the numerator and press “Enter”. If correct, the numerator box for the next fraction displays. Type in the second numerator and press “Enter”. If correct, the difference is displayed and the chimes ring. In the case of wrong answers, a blooper noise signals you to change your values. 

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