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Nelson Education > School > Mathematics K-8 > Mathematics 4 > Teacher Centre >Surf for More Math> Chapter 4 Lesson 2

Lesson 2 - Estimating Sums

To encourage students to have fun on the Web while learning about Estimating Sums, here are some games and interactive activities they can do on their own or in pairs.


Estimate sums by rounding.

Builds Upon

Student Book pages 90-91


Instructions for Use

Rounding Flashcards prompts students to estimate numbers by rounding.

To use Rounding Flashcards, round off the random number to the nearest units. Type your answer in the text field and press the 'Enter' button. Use the pull-down menu to change the Maximum Value of units. The number of correct answers and score are recorded.


Rounding Off prompts students to round off numbers to the nearest units.

To use Rounding Off, click on the level of difficulty and then the 'Start' button. Read the question and click on the answer you think is correct. Scores are recorded.