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Learning objects Wishball: tens

TLF ID L8458

Test your understanding of place value in two-digit numbers. Start with a two-digit whole number such as 57. 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, for example 12, using other digits. You can choose the final digit (the ‘Wishball’) to reach your target. Be careful not to overshoot (in addition) or undershoot (in subtraction) the target number! Try to achieve it within 20 turns, and in as few turns as possible. This learning object is one in a series of 15 objects.

Educational details

Key learning objectives
  • Students identify the place value of each digit in two-digit numbers.
  • Students add and subtract ones and tens in two-digit numbers.
  • Students read and interpret different representations of numbers.
  • Students apply mental computation skills.
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 voice-over support for key instructions.
Year level


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

    Other details

    • Technical implementer
    • Script writer
    • Name: Michael Wagner
    • Organisation: Godwin + Wagner
    • Address: Box Hill South VIC Australia
    • Subject matter expert
    • Name: John Flatt
    • Address: Geelong VIC Australia
    • Subject matter expert
    • Name: Howard Reeves
    • Address: Lindisfarne TAS Australia
    • Technical implementer
    • Publisher
    • Date of contribution: 20 Sep 2013
    • Organisation: Education Services Australia
    • Address: Melbourne VIC Australia
    • URL:
    Access profile
    • Colour independence
    • Device independence
    • Hearing independence
    Learning resource type
    • Interactive Resource
    • Microsoft Internet Explorer - minimum version: 8.0 (MS-Windows) - maximum version: 9.0 (MS-Windows)
    • Firefox - minimum version: (MS-Windows)
    • Safari - minimum version: 5.1 (MacOS)
    Operating systems
    • MacOS - minimum version: 10.6
    • MS-Windows - minimum version: XP - maximum version: 7
    Platform requirements
    • Due to the use of rich media content, this learning object is suitable for a connection speed of 256kb/s or faster.
    • © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.