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Nelson Education > School > Mathematics K-8 > Math Focus > Grade 7 > Teacher Centre > Surf for More Math > Chapter 2 - Lesson 11

Surf For More Math


Lesson 11: Communicate about Estimation Strategies

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


Explain how to estimate sums and differences of fractions and mixed numbers.

Builds Upon

Student Book pages 86–88

Instructions for Use

Add Fractions with Circles lets students practise adding fractions and mixed numbers having the same denominator using circles.

To use Add Fractions with Circles, scroll down to read the instructions and then scroll up and click on “Start” to see the first addend. Type the fraction in the “Whole”, “Numerator”, and “Denominator” boxes at upper right and click “OK”. If correct, a second addend is displayed below the first and the fraction for the first addend appears. Type the second 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 sum in the 3 upper right boxes and click “OK”. If right, “Sum 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 add the fractions, click on “Explain”. To view your score and print a report card, click on “Report”.

Subtract Fractions with Circles allows students to practice subtracting mixed fractions with unlike denominators using circles.

To use Subtract Fractions with Circles, follow the directions above for Add Fractions with Circles.