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Nelson Education > School > Mathematics K-8 > Math Focus > Grade 4 > Teacher Centre > Surf for More Math > Chapter 7 - Lesson 10

Surf For More Math


Lesson 10: Estimating Decimal Sums and Differences

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


Estimate sums and differences with decimals tenths and hundredths.

Builds Upon

Student Book pages 240-242

Instructions for Use

Decimal Darts allows students to predict differences using estimation strategies.

To use Decimal Darts, click on the instructions button on the first screen. Read the instructions and click on “return”. Click on “Start Game” and then select the number of players on the next screen. Enter the names of the player(s) and click on the level of difficulty you would like to play. Click on the “continue” button to start playing. An invisible number line is superimposed on a dart board and you need to calculate the location of a balloon and then throw a dart to pop the balloon.

Math at the Mall allows students to solve money problems involving addition and subtraction.

To use Math at the Mall, click on the “How to” button on the first screen. Read the instructions and click on the “close” button at the top of the screen. Click on the “Start” button to start playing the game. Use the arrow keys on your keyboard to navigate through the mall. Use your math skills with adding and subtracting fractions to purchase items at the mall and collect four gold coins to complete the game.