# Wishball: hundreds

TLF ID L8456

Test your understanding of place value with three-digit numbers. Start with a three-digit whole number such as 507. A spinner provides a randomly generated digit. Choose its place value and add it to (or subtract it from) your starting number. Work towards a given target number, say 539, using other digits. You can choose the final digit (the ‘Wishball’) to reach your target. Don’t overshoot (in addition) or undershoot (in subtraction) the target number! Try to achieve it within 20 turns, and in as few turns as possible.

#### Educational details

Key learning objectives
• Students identify the place value of each digit in three-digit numbers.
• Students add and subtract ones, tens and hundreds in three-digit numbers.
• Students read and interpret different representations of numbers.
Educational value
• Develops students’ understanding of place value.
• Stimulates students’ mental calculation strategies.
• Uses three different methods of representing numbers to assist students’ visualisation of place value.
• Scaffolds students’ attempts with immediate feedback.
• Encourages repeated use through randomisation of activity elements.
• Includes an option to print a record of the place-value decisions made for every turn in each game.
• Includes voiceover support for key instructions.
Year level

2; 3

Learning area
• mathematics
Strand
• Mathematics/Number and algebra
Student activity
• Interactives;
• Games;
• Experiment;
• Analysis;
• Modelling

#### Other details

Contributors
• Technical implementer
• Script writer
• Name: Michael Wagner
• Organisation: Godwin + Wagner
• Address: Box Hill South VIC Australia
• Subject matter expert
• Name: John Flatt
• Subject matter expert
• Name: Howard Reeves
• Technical implementer
• Publisher
• Date of contribution: 2016-10-10
• Name: Education Services Australia
• Organisation: Education Services Australia
• URL: www.esa.edu.au
• Date of contribution: 2016-10-10
• Name: Education Services Australia
• Organisation: Education Services Australia
• URL: www.esa.edu.au
• Name: Education Services Australia
• Organisation: Education Services Australia
• URL: www.esa.edu.au
Access profile
• Colour independence
• Device independence
• Hearing independence
Learning resource type
• Tablet friendly (Interactive resource)
Browsers
• Firefox - minimum version: (MS-Windows)
• ms-internet explorer - minimum version: 9.0 (MS-Windows) - maximum version: 11.0 (MS-Windows)
• Safari - minimum version: 7.0 (MacOS) - maximum version: 7.1 (MacOS)
Operating systems
• ms-windows - minimum version: 7 - maximum version: 10
• macos - minimum version: v7.1 - maximum version: OS X 10.10 Yosemite
Rights
• © Education Services Australia Ltd, 2016, except where indicated under Acknowledgements. This material may be used in accordance with the Creative Commons Attribution-ShareAlike 3.0 Australia (CC BY-SA 3.0 AU) licence https://creativecommons.org/licenses/by-sa/3.0/au/.

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